Friday, February 5, 2016

Standard Arithmetic Curriculum

ThinkAlgebra strongly recommends the teaching of a "standard arithmetic" curriculum that focuses on the critical foundations of algebra as stated by the National Mathematics Advisory Panel (2008), not a version of NCTM "reform math"--via Common Core or state standards--that does not. Students need a standard arithmetic curriculum to advance, not a reform math curriculum.

The teaching of standard arithmetic isn't going back to something that did not work in the past; it is boosting and revitalizing something that did work. Indeed, content knowledge in arithmetic and algebra (aka skills, ideas, uses) is the foundation for doing the math. Knowledge in long-term memory enables clear thinking, problem-solving, and creating.

The "understanding" of math is in the "doing" of math. For example, in 1st grade, students begin to understand the idea of addition (and perimeter) by calculating the perimeters of squares, rectangles, and other polygons using memorized facts and the efficient procedures of standard arithmetic. The number line is helpful at first. 
Elementary students also need science, geography, music,
art, history, etc.
But students need more than knowledge of standard mathematics; they also need knowledge of history, geography, science, art, and music--subjects that are often shortchanged in elementary school. Moreover, students need more than mere exposure to these subjects; they need knowledge in long-term memory. Understanding in reading requires broad knowledge in long-term memory. Reading comprehension, vocabulary development, and reading-to-learn open up the child's future. Put simply, knowledge is the key to clear thinking. 
Teaching kids "how to think" as a generalized skill has been a failed methodology in education for decades. We need to make sure students have gained sufficient domain knowledge upon which to think.  Kevin Ashton (How To Fly A Horse) writes, "Creation is a result--a place thinking may lead. Before we can know how to create, we must know how to think. Having ideas is not the same thing as being creative. Creation is execution [work], not inspiration. We are not all equally creative, just as we are not all equally gifted orators or athletes. But we can all create." The quality of one's thinking is a function of one's knowledge, and the quality of one's creativity is a function of one's thinking. The base of thinking well and, therefore, creating, is knowledge! The crux of the matter is that many educators do not think knowledge in long-term memory is that important. They are dead wrong! Downplaying knowledge is contrary to the fundamentals of the cognitive science of learning. (Read the next paragraph on reform math via Common Core.) 

Reform Math via Common-Core-Influenced State Standards
Slows the Learning of Standard Arithmetic.

SB, a journalist for TH, reports on Common Core’s use in a local school district (January 23, 2016). She writes, “Multiple strategies, versus a single algorithm, are taught. Common Core expects students to conceptually understand math. Students, for instance, are not taught rote memorization of multiplication tables. BH, the district’s PreK-12 mathematics coordinator, said students instead are taught reasoning and conceptual understanding to be fluent in multiplication facts.” Note. Reform math doesn't get kids to the level they need to be for success in algebra-1 in 8th grade or sooner. Not all kids will get there, but the students who learn math faster than others should, but most do not under a Common-Core-based curriculum. Also, in mathematics, the beginner is often overloaded cognitively with the extras of reform math (e.g., multiple strategies, making drawings, writing explanations, etc.) and with prep for mandatory testing (Every Child Succeeds Act); consequently, the student makes slow progress. Students should not waste time on the area model or strategy for division or multiplication, and most of the other strategies. In the modern classroom of group work, reform math, and test prep, there is little time for the teaching of standard arithmetic, which, for the reformers, is not a high priority. Also, other subjects are pushed aside or undervalued, such as science, geography, library time, music, history, art, etc. 

Really? Frankly, many of the so-called math reforms reported by journalist SB above are fads or practices with sparse evidence. The Common Core way sounds so inviting and appealing: Kids can reason the facts into memory. All you need is understanding. No need for rote memorization and all that old school stuff. No more drill for skill. Practice is out. It sounds too good to be true, and it is! On average, the math reforms have not worked as expected. The reason is that most math reforms have been based on anecdotal evidence and faddish ideas. That is, most reforms were not anchored in valid scientific evidence. The reformers seem to ignore the science of learning. The math reforms are unsatisfactory for teaching standard arithmetic to young children, yet they persist. They often disregard the cognitive science of learning and the major role of long-term memory in learning new ideas and problem-solving. The "multiple strategies" approach often confuses novices, increases cognitive load, and alienates parents. In the real world, students learn new stuff from old stuff they already know. Hence, knowledge in long-term memory is the key to learning more math, faster; it enables clear thinking and problem-solving (i.e., critical thinking in math). Consequently, gaining essential factual and efficient procedural knowledge in long-term memory as quickly as possible should be a primary goal of math education, but, apparently, it isn't.

The consequence: math achievement has been stalled for decades. Recent data corroborate a continuing trend of poor math achievement. The 2015 NAEP math scores for 4th and 8th-grade students are lower than in 2013. According to the latest ACT scores, most students are still ill-prepared for college. It is disappointing, but not surprising. (NCTM math reforms since the early 90s combined with NCLB test-based accountability reforms since the beginning of 2000s have led to substandard math achievement. So have fads, progressive policies of sameness, and weak teacher training.) Nothing new. Diane Ravitch writes in her blog (1-31-16), "The bad part about ESSA [the new Every Child Succeeds Act] is that it preserves the mindset of NCLB, a mindset that says that standards, testing, and accountability are the keys to student success. They are not." 
In its 2008 report, the National Mathematics Advisory Panel (NMAP) stated the Critical Foundations of AlgebraDr. William Quirk, Ph.D. in mathematics, noted that some of the critical foundations are missing from Common Core, now state standards. They included the automatic recall of single-digit math facts, the automatic execution of the standard algorithms, the proficiency with fractions, including decimals, percentages, and negative fractions, and the geometry formulas to analyze the properties of 2- and 3-dimensional shapes (perimeter, area, volume, surface area). Also, the NMAP made clear that "practice allows students to achieve automaticity of basic skills—the fast, accurate, and effortless processing of content information—which frees up working memory for more complex aspects of problem-solving." That is, the NMAP acknowledged a fundamental idea of the science of learning. As expected, the main stumbling blocks in algebra are the automatic recall of number facts, the automatic execution of the standard algorithms, and the fraction equivalents and operations, including decimals and percentages. In summary, a primary reason students stumble in algebra is that they are weak in standard arithmetic.
Other Comments
Reformers believe that kids can "reason" the multiplication facts into memory. No need for rote memorization, which is Old School. The reformers are wrong, of course. It’s illogical to think this way. Rote does not preclude some level of conceptual understanding. The concept of multiplication is simple and easily shown on a number line, and the meaning of single-digit facts, such as 2 x 5, which is two sets of 5 in each set, is also uncomplicated for 2nd graders to grasp. Indeed, students should learn essential facts and step-by-step procedures by repetition, which is drill for skill.

The people who wrote the standards, policymakers, so-called “math educators,” professors from schools of education, and many others who advocate the reforms in math have little knowledge of the science of learningReadiness for an idea or topic is not a matter of age but a function of mastering prerequisites in long-term memory. Students learn new ideas that are linked to old ideas they already know. They must memorize the times tables and work with the standard algorithms to advance to the next level. They need to learn to reduce fractions to their lowest terms, add numbers with different signs, line up decimal points, and so on. In short, students must master standard arithmetic to advance to the next level, which is algebra in middle school. Reform math via Common Core doesn't get them there. 

The Common Core Way slows the learning of standard arithmetic and leads to increased cognitive load. The "multiple strategies" approach in Common Core or state standards confuses students, alienates parents, increases cognitive load, and makes learning standard arithmetic more elusive and needlessly complicated. To move forward, students must master standard arithmetic first. However, under the yoke of Common Core, students' minds are cluttered with multiple convoluted strategies to do simple arithmetic, which stalls achievement. In reform math, the standard algorithm has been put on the back burner, which is contrary to the science of learning and the advice of mathematicians, e.g., W. Stephen Wilson, H.H. Wu, James Milgram, and many others, like Sandra Stotsky, who was on the National Mathematics Advisory Panel (2008) and validation committee. 

The "understanding" of arithmetic is in the "doing" of arithmetic and includes skills, ideas, and uses. Indeed, to do arithmetic well, students must be competent in calculating the standard algorithms first. Moreover, students need to grasp when to add, subtract, multiply, and divide, which is pattern recognition. Also, learning standard arithmetic requires three primary ingredients: (1) competence in computational skills(2) key ideas of K-6 mathematics (rules, fractions, variables, equations, functions, negative numbers, graphs), and (3) uses of mathematics (applications in science, business, finance, economics, tech, engineering; also area, volume, perimeter, etc.). [Notes. "Understanding grows gradually," writes the late mathematician Robert B. Davis (The Madison Project, 1957). Incidentally, my Teach Kids Algebra program (TKA) focuses mostly on the fundamental ideas of elementary school mathematics. The biggest drawback is that students do not learn enough standard arithmetic in their regular classrooms. It has been a decades-old problem. Moreover, the influence of the classroom teacher has dwindled over the decades due to reforms and fads imposed on schools. Teachers have little say in curriculum or instruction. They are often told to teach to the testThey did not create the mess in education and should not be blamed for it. Put simply, bad ideas and fads are often imposed on teachers who have little say.]

In Common Core, rote learning, which is learning by repetition, has been replaced by conceptual understanding and, apparently, reasoning, both of which are difficult to pin down or measure (quantify). Indeed, how do reasoning and understanding make students "fluent" in the times tables or the standard algorithm? It's a leap of faith. They don't! The assumption from reform math is contrary to the science of learning. Furthermore, “fluent” or “fluency” in reform math via Common Core or state standards is not explicitly defined. What does fluent mean in this context?

Rote learning means learning by repetition and is a fundamental technique for learning anything. The concept of multiplication and the meaning of the multiplication facts (3 x 5 means three sets of five in each set or a total of 15) are easy to grasp when practiced well. Also, the standard algorithm always works and is easy to learn when the single-digit multiplication facts are automated in long-term memory. Learning multiplication or standard arithmetic well requires ample practice, that is, drill for skill. The notion of math reforms is that reform pedagogy and group work are much more important than "mathematical substance." The teacher doesn't teach; the teacher facilitates. Long-term memory knowledge is not that important, say the reformists. The reformers are wrong! 

Memorizing the single-digit multiplication facts (i.e., automating them in long-term memory) makes them instantly available for learning new content (factual and procedural knowledge), new concepts, and the standard algorithms. They enable problem-solving. Instead of memorizing the facts, Common Core wants kids to "reason the facts," that is, calculate them from known facts, which, presumedly, they had memorized. It is illogical. Indeed, a child cannot "reason something" without first gaining sufficient knowledge in long-term memory. Also, calculating the multiplication facts (as needed) wastes time and needlessly clutters and reduces memory space needed for problem-solving and learning new content. (Note. "Working Memory" space is very limited.) In short, the so-called Common Core way often ignores the intrinsic relationship between working memory and long-term memory and the critical importance of gaining factual and standard procedural knowledge in long-term memory to enable problem-solving, understanding, and illumination.

Indeed, it is fantasy, even bizarre to believe or postulate that those students through reasoning and understanding will acquire fluency, which is to "get" the times table into long-term memory. Consequently, most kids are not good at calculating (i.e., the skills, ideas, uses of arithmetic). Facts and efficient procedures must be automated to do arithmetic well. A visually-moderated sequence (VMS) of steps, if practiced enough, becomes automatic in long-term memory. Memory is better (and faster) than generating single-digit math facts by calculating (reasoning the facts) or using an inefficient area model to multiply or divide, and so on. 

Lastly, Richard E. Nisbett (Mindware) points out, "Although the unconscious mind [long-term memory] can compose a symphony and solve a mathematical problem that's been around for centuries, it can't multiply 173 by 19." The conscious mind [working memory] can do arithmetic, but it follows the rules automated in the unconscious mind. Nisbett points out, "The unconscious mind operates according to rules. I know the rules of multiplication, I know the number 173 and 19 are in my head, I know I must multiply 3 by 9, save the 7 and carry the 2, and so forth. I can check that what's available in my consciousness is consistent with the rules that I know to be appropriate. But none of this can be taken to mean that I am aware of the process by which multiplication is carried out." Nisbett sums up, "Don't assume that you know why you think what you think or do what you do.1-30-16 To Be Revised
Special Interests, Philanthropists, & Government Rule Education
The latest technologies, innovations, fads, and reforms have not energized rapid gain in K-12 math and science achievement.
 Moreover, they will not revive rapid economic growth either, asserts economist Robert J. Samuelson, who says that our economic growth lags behind regardless of innovation. (Economic growth was about 2% in 2015 compared to China's growth of nearly 7%.) Our education system has stalled for decades and so has economic growth. Are the two strongly correlated or is it merely a coincidence? Also, it appears that special interests (school publishers, test makers, tech companies, etc.) have highjacked control of K-12 education with the assistance of government mandates and money ($$$$$) from both government and philanthropists who think they know how to fix education. The government at all levels (federal, state, and school district) and philanthropists (e.g., Gates, Zuckerberg, et al.) are often dead wrong. Just as in government, education has become a giant bureaucracy empowered by special interests. 
Comments: ThinkAlgebra@cox.net
©2016 LT/ThinkAlgebra

Wednesday, December 30, 2015

Adding It Up

Adapting Thinking: Adding It Up 

Why is a 2nd-3rd-grade question given to 8th graders? Expectations are low. 

Only 61% of 13-year olds selected the correct answer. In my view, it is a 2nd-grade question, not a middle school question, and clearly indicates the fundamental relationship between addition and subtraction that all 13-year olds should know, but, apparently, many don't. If arithmetic were taught well, then most 2nd graders would have selected the correct answer without calculating. The example from Adding It Up (2001) [1] shows how poorly arithmetic has been taught under NCTM reform math. However, in my opinion, Adding It Up seems to confirm many reform math practices while ignoring the science of learning. For decades, the use of calculators and so on, which are typical NCTM math reforms, have pushed aside standard arithmetic in K-8 schools, an error in judgment. 

Adding It Up: "Only 61% of 13-year-olds chose the right answer, which again is considerably lower than the percentage of students who can compute the result." What percentage might that be? 90%? 100%? Adding It Up erroneously assumes or suggests that students who practice standard algorithms for mastery have little understanding of number relationships. The reason that only 61% of the 8th graders selected the correct equation, rather than a higher percentage, is that the fundamentals of arithmetic (via NCTM reform math) have not been taught well. The relationship between addition and subtraction is basic arithmetic, but so is competence in calculating via the standard algorithms (paper-pencil). Also, G. Polya (How To Solve It) states that understanding in mathematics is in the doing of arithmetic, i.e., applying it. 

Note. The Adding It Up report (PreK-8) of 2001 from the National Research Council is hardly the final word, of course. The Adding It Up theory of proficiency in mathematics is a fabricated on five intertwined strands: conceptual understanding, procedural fluency, strategic competence, adaptive reasoning, and productive disposition. The far-reaching theory of proficiency is based more on judgment than on science and has never been tested. In fact, there are countries that clobber US students in math, yet the Adding It Up report asserts that "no country--not even those performing highest on international surveys of mathematics achievement do all students display mathematical proficiency as we have defined it in this report." Put simply, the five intertwined strands of proficiency are not practical and almost impossible for typical kids to achieve, even the best kids.   

Adding It Up provides cover for NCTM reform math programs, such as Investigations (TERC), a program that is still used in many schools and embodies the math reform movement that focuses more on understanding than on learning standard arithmetic. The Investigations curriculum uses "minimal guidance during instruction" methods, that is, child-centered discovery activities. After examining the 5th-grade materials, mathematician W. Stephen Wilson (Johns Hopkins University), wrote that Investigations was not standard arithmetic. He called it pre-arithmetic. Professor Wilson writes, "Arithmetic is the foundation. Arithmetic has to be a priority, and it has to be done right." Starting in 1st grade, Singapore math does it right most of the time [2]; however, Investigations and other reform math programs do not.

Adding It Up has had a profound influence in math education, and, often, not in a good way. Its central premise is that proficiency is too narrowly defined. The report states, "Mathematical proficiency, as we see it, has five (intertwined) strands." Really? More judgment, less research. Also, the report states, "Many educational questions, however, cannot be answered by research." Education depends on "judgments" that "often fall outside the domain of research," especially in curriculum and instruction. Really?

I disagree. Math is hierarchical: one idea builds another and everything fits together logically. A good math curriculum starts with standard arithmetic. We know the essential content and skills (the curriculum) needed to get kids off to a world-class start starting in 1st grade. Indeed, content and its associated skills are hierarchical, along with intellectual skills (Gagne: instructional design and prerequisites) [3]. Because math builds in long-term memory, the proper sequencing that creates coherence (a learning hierarchy) in a math curriculum is paramount [4].

Moreover, Gagne writes that "intellectual skills are arranged in a hierarchical order so that successful instruction begins with teaching lower-order skills and progresses upwards." Furthermore, in addition to arithmetic, the elementary school math curriculum should include parts of algebra, geometry, and measurement to prepare for a full course in algebra by middle school. Also, we know from cognitive science that direct instruction is strikingly more efficient than the favored minimal guidance methods of teaching, group work, nonstandard algorithms, manipulatives, and multiple representations, which are among the least effective. In short, the diverse group of Adding It Up writers ignores the cognitive science of learning.

Despite what you may have heard from reform math apostles, there is nothing intrinsically wrong with standard arithmetic. Indeed, it is the keystone for higher-level math. Therefore, very young students should practice standard algorithms for mastery, grasp the rules of arithmetic that govern the behavior of numbers, memorize math facts for auto recall in problem-solving, and apply math concepts to everyday problems.

Beginners need lots of factual and procedural knowledge to do the math, says Daniel Willingham, a cognitive scientist. Indeed, knowing and doing math well requires factual and procedural knowledge in long-term memory. The modern reform math methods of minimal guidance during instruction (e.g., discovery, inquiry, problem-based, etc.) don't work, say, Kirschner, Sweller, & Clark. They point out, "Evidence for the superiority of guided instruction is explained in the context of our knowledge of human cognitive architecture [working and long-term memories], expert-novice differences, and cognitive load." 

Children are not pint-sized mathematicians or experts; they are novices. Contrary to Adding It Up, beginners don't need to explain their reasoning, make drawings, or engage in group work to learn arithmetic well. Students need straightforward instruction via carefully thought out, coherent, hierarchically organized worked examples. The standard algorithms are the most efficient ways to do arithmetic, but for years, they have been under brutal attack. Reformists say the standard algorithms are too hard for some students to learn, threaten a student's growth in independent thinking, and are obsoleted by calculators. These are bogus arguments. The National Mathematics Advisory Panel (2008) explicitly stated that students must master standard arithmetic to prepare for algebra, not something that looks like arithmetic or something that has no long-term value. 


According to Adding It Up, "Nearly all second graders might be expected to make a useful drawing of the situation portrayed in an arithmetic word problem as a step toward solving it." In short, making a picture is the first step needed to solve a word problem. Nonsense! The idea of "making a drawing" as a necessary step for problem-solving has emerged as a best practice in reform math programs via NCTM and now Common Core state standards, etc. The idea is misguided.


Add It Up Box 5.15 Never teach these strategies. Teach the standard algorithm.

Adding It Up sharply criticizes the standard algorithm for division. I won't go into details, but the report is wrong.

Instead, the report offers two alternative versions. One is Box 5-15. The other is the "partial quotients" model shown in Box 5-16 below. 

No one uses the partial quotient method to do long division (Box 5-16) or the area model to do multiplication, etc., much less the methods shown in Box 6-15. Who would calculate this way? They are a waste of classroom time.

Add It Up Box 5-16 Teach the standard algorithm, not this.

Still, in modern reform math classrooms, a disproportionate amount of classroom time is spent on these and other similar calculation strategies leaving efficient standard algorithms, which are vital, on the back burner. In my opinion, nonstandard, complicated, multiple strategies to do simple arithmetic are usually a waste of valuable instructional time. Kids need to know the standard algorithms (Box 5-14)

The long division standard algorithm should start no later than 3rd grade with up to 4 digits divided by one digit, sometimes two digits.
This is the standard algorithm. Teach it first.



Notes
[4] Break a problem into smaller problems. 

This is a fundamental idea taught in mathematics, and it can carry over to everyday life. Also, the idea that new knowledge builds on old knowledge is central to learning math. Because math builds in long-term memory, the proper sequencing that creates coherence (a learning hierarchy) in a math curriculum is paramount. Here is a sequencing example from Science--A Process Approach (SAPA), which uses Gagne’s hierarchical approach. It is not hit and miss. The sequencing (learning hierarchy) must work in the classroom, which is the reason SAPA was tested extensively and rewritten several times before it was released to the public.

Part C is 2nd Grade - 1967
FYI: Integers were introduced in Part B, 1st Grade. 

Notes
[1] Adding It Up is a product of the National Research Council, specifically the Mathematics Learning Study Committee, Division of Behavioral and Social Sciences and Education (2001). According to the report, Adding It Up was written by a committee composed of "diverse backgrounds." Its theory of proficiency in mathematics is based on five strands: conceptual understanding, procedural fluency, strategic competence, adaptive reasoning, and productive disposition. The theory is based more on judgment than on science and never tested. What, no mathematicians?

[2] Singapore 1st-grade students learn much more standard arithmetic than American 1st-grade students and so on up the grades. The curriculum is better than in most countries. Still, the Singaporean 1st-grade math curriculum isn't perfect. In my view, it lacks some essential content, especially algebra and integers, topics I typically teach to 1st-grade students. Moreover, the overemphasis on bar models (drawings) to solve arithmetic problems in Singaporean math can be distracting. A few kids might benefit from drawing bar models, but, for many kids, making a drawing slows up and disrupts cognitive activity. 

[3] Robert Gagne greatly influenced the hierarchy of Science A Process Approach (SAPA) by identifying the processes and prerequisites: observing, classifying, using numbers, measuring, predicting, inferring, formulating hypotheses, and interpreting data. But these processes are actually skills, which are essential to inquiry, analytic thinking, and problem-solving, explains Henry P. Cole (Process Education, 1972). The processes are actually skills of doing something, so they are measurable. The thinking is hidden in the doing.  

To Be Continued. 

©2016 LT/ThinkAlgebra

 

Friday, November 20, 2015

Mathematical Language

Mathematical Models (Equations)

Area Model [5th Grade] Add it up!
I hope teachers toss out 
this junk and focus on 
standard algorithms.


What has happened to simple arithmetic? The uncomplicated answer is that inferior methods from reform math have been in vogue for decades. For example, in reform math via State Standards and Common Core, students are often asked to make drawings, such as the area model (5.3 x 2.4), to calculate or justify their math, which I think is confusing, pointless, and useless for novices. Indeed, popular reform math methods make simple arithmetic unduly and ridiculously complicated. 

The modern "visual" approach, such as the area model (left), in my opinion, wastes valuable classroom time on pointless material that leads nowhere. Put simply, no one calculates this way! Why should kids labor over nonessentials? ( In contrast to American math instruction, kids in top-performing nations drill and memorize important math facts and practice for mastery efficient procedures for abstract operations starting in the 1st-grade. Indeed, 1st-graders in Singapore carry and borrow (regroup) in standard addition and subtraction calculations, do multiplication as repeated addition and write equations in three operations--addition, subtraction, and multiplication--from word problems. Our 1st-graders do not come close. )

The "visual" approach seems confusing and needlessly complex. It inhibits the learning of standard arithmetic by restricting the time spent on learning the standard algorithms. Standard algorithms are often minimized and portrayed as merely one of many ways to calculate--even discouraged in many classrooms. The efficient use of standard algorithms requires the memorization of single-digit math facts in long-term memory. Reformers claim that "sketching visuals" is needed to show understanding or as justification for answers, which is reform math hype. Regrettably, the importance of numerical relationships and their symbolic representations in mathematical language, which are important for understanding standard arithmetic, have been undervalued, trivialized, and delayed. Children are novices; they need to memorize single-digit math facts, practice standard algorithms for mastery, use mathematical language, and mathematize word problems. 

The symbols of math, detached from physical content, and the abstract operations of arithmetic are the very essence of algebra. Abstract rules, such as a + b = b + a, or (a + b) + c = a + (b + c), or a(b + c) = ab + ac, and others, govern all of arithmetic, including the standard algorithms. "The strength of arithmetic lies in its absolute generality. Its rules admit of no exceptions: they apply to all numbers," writes Tobias Dantzig (Number, 1930).  

Furthermore, an important part of understanding arithmetic-that-leads-to-algebra is the ability to do arithmetic quickly, efficiently, and effortless. Students should avoid doing calculations via complicated visuals or drawings (extra baggage), such as the area models, array models, charting models, bar models, or other drawings. In contrast, to do simple arithmetic, the student should use fast, efficient procedures that are the standard algorithms. The drawings often become the focus, and they distract from the straightforward mastery of basic arithmetic needed to advance to algebra and beyond. Doing math well is doing it as simply and as efficiently as possible, which is contrary to reform math methods. Reform math apostles argue that students understand math only when they can make a "drawing" or write an "explanation" as a justification for an answer. They are wrong!

In my opinion, instructional time is better spent on standard arithmetic, writing equations and finding solutions to solve problems (aka mathematizing). It is important for students to express numerical relationships in abstract, mathematical language, such as y = 3x - 1. 

The understanding of mathematics is rooted in the meaning of symbolic mathematical language, not in drawing visuals, etc. It is rooted in the abstract, not in the concrete. 


The 4th-grade student figured out the rule
and wrote an equation. 

Basic algebra is accessible to very young children when it is fused to the fundamentals of standard arithmetic. My "early algebra" program (Teach Kids Algebra) is an attempt to do this in actual classrooms. I use x-y tables as a stepping stone for figuring out function rules that lead to writing equations in two variables. Students can find function rules to complete x-y tables, write linear equations, work backward with inverse concepts (undo) to find x when given y, and graph tables on a coordinate plane. The key part is writing an equation. I have used function rules and building tables as methods for writing equations as early as 1st-grade in my Teach Kids Algebra program. By 4th-grade, the equations are more difficult (See table: left). The inverse concept is an important and useful mathematical concept, not only for table building but also for solving equations. Unfortunately, inverses are seldom taught in early elementary school. It seems that educators think that inverse ideas to solve equations are too advanced. I disagree. Even 1st-grade students can understand simple inverse ideas: 6 + 4 - 4 = 6 or n - 5 + 5 = n. It is simple to demonstrate and easy to learn by reasoning. 

"Mathematical expressions and sentences [equations] can be applied to real life situations to describe numerical relationships. The same mathematical expression or sentence [aka equation] may represent the numerical facts in more than one situation." (Dolciani & Wooton, Modern Algebra, 1970 ) The numerical relationships are mathematical models.

[Special Note. Reform math people think the best way to make sense of math is through creating visuals, such as charts, graphs, and diagrams, not symbolic representations. I think this is superficial because students should focus on the symbolic representation, not drawings. The reformers claim a better way to learn algebra is through tables and graphs made on a graphing calculator. If that were true, then our students would be the best algebra students in the world. Unfortunately, the graphing calculator is required for most algebra classes and the SAT. The overuse of graphing calculators to solve problems in algebra textbooks is often at the expense of symbolic representations and manipulation. 

What is important, I think, is that young students use mathematical language to write expressions and equations and use algebra concepts to solve equations. Too often, our math programs do not stress abstract, symbolic representation enough. Moreover, we should not insist that students make drawings or write an explanation to justify answers. Students need to mathematize word problems via the language of math (aka equations). Then, they need to apply algebra concepts (inverses) to solve the equations. In short, students need to write and solve equations. For example, my 1st-grade students figured out function rules, wrote equations, built tables, and plotted the graphs in Q-1.] 

Mathematical models are written in mathematical language: symbols for the known numbers, the unknown (variables), operations, calculations, solutions, etc. Furthermore, mathematical models imply a level of understanding, knowledge, and skills, which are substantially better than making visuals or writing an explanation as an afterthought. Students must be able to convert (mathematize) a word problem into mathematical language correctly. In short, the student must be able to abstract what is known (the numbers), the unknown, the operations needed, and then synthesize them into a coherent whole, that is, an equation that corresponds to or models directly the word problem.

Writing equations in the 1st grade to describe
word problem situations is a key skill. 
Converting a word problem into mathematical language (aka an equation) should start in early elementary school. To solve equations, 1st-grade students can use guess and check, the rule for substituting and memorized math facts to find the "unknown." By the 3rd- or 4th-grade, well-trained students should change over to ab efficient algebraic technique, which is "unpacking" via inverse operations (UNDO). The technique is very important in algebra. 


Writing and solving equations that lead directly to a correct solution requires adequate (prerequisite) mathematical knowledge and thinking. The steps are enough to imply understanding. Indeed, writing an equation and solving it in a sequence of logical steps to find the unknown is the root of understanding in mathematics.

To mathematize a word problem, students need to separate the known numbers, the operation(s) needed, and the unknown from the words and then put the symbols together in an equation that corresponds to the problem and, when solved or calculated, leads to a correct solution.



Teaching children to write and think in mathematical language is not an easy task. Traditionally, mathematizing has been a troublesome area in our math programs. Still, kids must learn to write and think systematically in mathematical language, beginning in 1st-grade, which is when Singapore children start to write equations in one variable.

Note. In the equation n + 12 = 45, to undo add 12, subtract 12 from both sides of the equation to isolate n and maintain the balance (equality). Algebra focuses on equations. It is vital that young children turn sentences or word problems into math language (aka an equation) and practice for mastery the algebra techniques for solving equations, which means to isolate the variable. To isolate the variable is to get the variable n by itself on one side of the equation, such as n = 33. To do it (method), we undo operations. "For the two sides of the equation to stay equal, whatever we do to one side has to be done to the other."


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Sample 3rd-Grade Problem
Sally has some pencils. Ben gives her 79 more pencils. Now Sally has 167 pencils. How many pencils did Sally have at the beginning? (Think this way: The known numbers are 79 and 167the operation is +, and the unknown is n. With these abstract symbols (aka math language) think up an equation that closely models the word problem and leads to a correct solution when solved. See below.) 

Mathematical Models
Applying Mathematical Language & Thinking

n + 79 = 167
n + 79 = 167 (calculating, solving)
     -79    -79
n +  0   = 167 - 79
n = 88

88 + 79 = 167 (checking)
167 = 167 (true)

The model in mathematical language becomes 88 + 79 = 167.
The steps shown above imply adequate understanding.
Drawings or explanations are not needed or helpful.
Nonmathematical Language: Sally started with 88 pencils.

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Note Well. First-grade and second-grade students should start with true/false concepts, guess and check, rule for substituting, and memorized math facts to solve simple equations, such as x + x - 3 = 7, but experienced 2nd-grade and most 3rd-grade students should leave guess and check behind and advance to a fundamental algebra idea that equations can be solved by "undo" operations (inverses) to isolate the variable. Thus, for the equation n + 79 = 167, to undo add 79, subtract 79. Insist that students show the steps and standard calculations needed to communicate and express their understanding. Addition and subtraction are opposites or inverses of each other and undo each other. Thus, n + 79 - 79 is n + 0 or n. Also, the operation of subtracting 79 must be applied to both sides of the equation to keep the equation balanced (equal). Multiplication and division are inverses, too, and undo each other. When working with equations, students should always Think Like A Balance. 


Note. The model 88 + 79 = 167 applies to many different mathematical situations, including the pencil problem above. It is the power of abstraction in mathematics. A simple math fact, such as 2+3=5, is a mathematical model but, because it is commonplace, we do not think of it as a model. Despite its simplicity, the 2+3=5 addition fact is a very powerful model and applies to many different concrete situations found in the real world, which is the point the late Morris Kline makes in his book Mathematics for the Nonmathematician, 1967.

[Aside. Morris Kline, a mathematician, writes, "When a child learns that 5 + 5 = 10 [or 36 ÷ 9 = 4, etc.], he acquires in one swoop a fact which applies to hundreds of situations. Part of the secret of the power of mathematics is that it deals with abstractionsWhole numbers and fractions and the various operations with whole numbers and fractions are abstractions."]


Put simply, arithmetic is abstract and should be taught through conceptual symbols.
Its understanding is rooted in abstract, symbolic language. The problem with arithmetic today is that we have gotten away from its symbolic structure and substituted pseudo-mathematical models and thought such as the area model or the array model.

Unfortunately, we have underestimated the key importance of standard algorithms (fast, efficient procedures), which are part of the wonderful, abstract tapestry of mathematics, and the memorization of single-digit math facts for auto recall in problem-solving, which is a basic tenet of cognitive science (the relationship between working memory and long-term memory). Practice and memorization are part of learning the structure and method of arithmetic and algebra.

Put simply, for decades we have been teaching math poorly. The reason is that progressive reform math has been taught while tried-and-true standard arithmetic, memorization, and practice have been deemphasized. We need to restore traditional arithmetic, both structure and methods, that prepares students for algebra in middle school.

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[Extra. Demonstrate that the expressions 56 • 1/8 and 7 are equivalent by stating the reason that justifies each step. Showing the steps implies adequate understanding. The steps, themselves, are enough; however, students should also know the reasons that govern each step, so they do correct mathematics. 





An equation consists of two expressions set equal to each other. The rules of arithmetic and algebra consist of assumptions, principles, definitions, axioms, properties, and conventions. Some equations contain variables such as x + 3x = 200. The coefficients of x and 3x are 1 and 3 respectively. We do not write 1x just x. Also, 3x is a product and means 3 • x or x + x + x. Students must know the rules and use them. Expressions and equations show numerical relationships.] 

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Dr. Katharine Beals (Out in Left Field), summarizes reform math: "Along with group work, group discovery, multiple solutions, and, of course, explaining answers to easy problems, there's doing math visually." I think Beals is right. The problem with all this is that kids do not learn much content. Early on, elementary students are not required to work with abstract, symbolic representations, which are so vital to understanding arithmetic and algebra. 

Relying too much on visual representations often downplays the importance of mathematical language that is the writing of equations from word problems (mathematizing), the use of algebra concepts to solve the equations, and the learning of conceptual symbols to do arithmetic. The problem starts in the lower elementary school where students use counting strategies (via visuals, pictures, manipulatives, etc.) to do simple arithmetic. I am disturbed that students are often required to make a drawing for a world problem or write an explanation for easy arithmetic. The meaning of mathematics is rooted in mathematical language, not in making visuals, etc.  It is rooted in the abstract, not in the concrete. 




To Be Revised

Last update: 11-24-15, 11-28-15, 11-29-15, 11-30-15

Credits
Model: Jayne
Some ideas of mathematizing from Numbers by Alfred S. Posamentier & Bernd Thaller
The idea of showing that 5 •1/8 and 7 are equivalent expressions is from Modern Algebra by Dolciani & Wooton 
Area Model from Kaplan: A Parent's Guide to the Common Core, Grade 5