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Math wars is the debate over modern mathematics education, textbooks and curricula in the United States that was triggered by the publication in 1989 of the Curriculum and Evaluation Standards for School Mathematics by the National Council of Teachers of Mathematics (NCTM) and subsequent development and widespread adoption of a new generation of mathematics curricula inspired by these standards.
While the discussion about math skills has persisted for many decades, the term "math wars" was coined by commentators such as John A. Van de Walle and David Klein. The debate is over traditional mathematics and reform mathematics philosophy and curricula, which differ significantly in approach and content.
Advocates of reform
The largest supporter of reform in the US has been the National Council of Teachers of Mathematics.
One aspect of the debate is over how explicitly children must be taught skills based on formulas or algorithms (fixed, step-by-step procedures for solving math problems) versus a more inquiry-based approach in which students are exposed to real-world problems that help them develop fluency in number sense, reasoning, and problem-solving skills. In this latter approach, conceptual understanding is a primary goal and algorithmic fluency is expected to follow secondarily. 
A considerable body of research by mathematics educators has generally supported reform mathematics and has shown that children who focus on developing a deep conceptual understanding (rather than spending most of their time drilling algorithms) develop both fluency in calculations and conceptual understanding. Advocates explain failures not because the method is at fault, but because these educational methods require a great deal of expertise and have not always been implemented well in actual classrooms.
A backlash which advocates call "poorly understood reform efforts" and critics call "a complete abandonment of instruction in basic mathematics" resulted in "math wars" between reform and traditional methods of mathematics education.
Critics of reform
Those who disagree with the inquiry-based philosophy maintain that students must firstdevelop computational skills before they can understand concepts of mathematics. Theseskills should be memorized and practiced, using time-tested traditional methods until they become automatic. Time is better spent practicing skills rather than in investigations inventing alternatives, or justifying more than one correct answer or method. In this view, estimating answers is insufficient and, in fact, is considered to be dependent on strong foundational skills. Learning abstract concepts of mathematics is perceived to depend on a solid base of knowledge of the tools of the subject. 
Supporters of traditional mathematics teaching oppose excessive dependence on innovations such as calculators or new technology, such as the Logo language. Student innovation is acceptable, even welcome, as long as it is mathematically valid. Calculator use can be appropriate after number sense has developed and basic skills have been mastered. Constructivist methods which are unfamiliar to many adults, and books which lack explanations of methods or solved examples make it difficult to help with homework. Compared to worksheets which can be completed in minutes, constructivist activities can be more time consuming. (Reform educators respond that more time is lost in reteaching poorly understood algorithms.) Emphasis on reading and writing also increases the language load for immigrant students and parents who may be unfamiliar with English.
Critics of reform point out that traditional methods are still universally and exclusively used in industry and academia. Reform educators respond that such methods are still the ultimate goal of reform mathematics, and that students need to learn flexible thinking in order to face problems they may not know a method for. Critics maintain that it is unreasonable to expect students to "discover" the standard methods through investigation, and that flexible thinking can only be developed after mastering foundational skills.
Some curricula incorporate research by Constance Kamii and others that concluded that direct teaching of traditional algorithms is counterproductive to conceptual understanding of math. Critics have protested some of the consequences of this research. Traditional memorization methods are replaced with constructivist activities. Students who demonstrate proficiency in a standard method are asked to invent another method of arriving at the answer. Some teachers supplement such textbooks in order to teach standard methods more quickly. Some curricula do not teach long division. Critics believe the NCTM revised its standards to explicitly call for continuing instruction of standard methods, largely because of the negative response to some of these curricula (see below).
Examples of reform curricula introduced in response to the 1989 NCTM standards and the reasons for initial criticism:
- Mathland (no longer offered)
- Investigations in Numbers, Data, and Space is criticized for not containing explicit instruction of the standard algorithms
- Core-Plus Mathematics Project, initially accused of placing students in remedial college math courses, a report that was later challenged.
- Connected Mathematics, criticized for not explicitly teaching children standard algorithms, formulas or solved examples
- Everyday Math , criticized for putting emphasis on non-traditional arithmetic methods.
Critics of reform textbooks say that they present concepts in a haphazard way.  Critics of the reform textbooks and curricula support traditional textbooks such as Singapore Math and Saxon math, which emphasize algorithmic mathematics, such as arithmetic calculation, over mathematical concepts.
Reform educators have responded by pointing out the favorable research results of reform curricula, especially at the elementary school level. The government-appointed What Works Clearinghouse has found that, out of 61 studies of effect of elementary school Everyday Mathematics textbooks, 57 did not meet WWC evidence standards, and the remaining 4 met such standards with reservations and demonstrated potentially positive effect on math achievement, whereas for Saxon Elementary School Math, out of 7 studies, only one met WWC evidence standards with reservations, but demonstrated "no discernible effects on math achievement."
In 2000 NCTM released the PSSM, which was seen as more balanced than the original 1989 Standards. This led to some calming, but not an end to the dispute. Two recent reports have led to considerably more cooling of the Math Wars. In 2006, NCTM released its Curriculum Focal Points,, which was seen by many as a compromise position. In 2008, the National Mathematics Advisory Panel, created by George Bush, called for a halt to all extreme positions.
NCTM 2006 recommendations
In 2006, the NCTM released Curriculum Focal Points, a report on the topics considered central for mathematics in pre-kindergarten through eighth grade. Its inclusion of standard algorithms led editorials in newspapers like the Chicago Sun Times to state that the "NCTM council has admitted, more or less, that it goofed," and that the new report cited "inconsistency in the grade placement of mathematics topics as well as in how they are defined and what students are expected to learn."  NCTM responded by insisting that it considers "Focal Points" a step in the implementation of the Standards, not a reversal of its position on teaching students to learn foundational topics with conceptual understanding. Francis Fennell, president of the NCTM, stated that there had been no change of direction or policy in the new report and said that he resented talk of “math wars”.
National Mathematics Advisory Panel
On April 18, 2006, President Bush created the National Mathematics Advisory Panel, which was modeled after the influential National Reading Panel. The National Math Panel examined and summarized the scientific evidence related to the teaching and learning of mathematics,  concluding, "All-encompassing recommendations that instruction should be entirely 'student centered' or 'teacher directed' are not supported by research. If such recommendations exist, they should be rescinded. If they are being considered, they should be avoided. High-quality research does not support the exclusive use of either approach." The Panel effectively called for an end to the Math Wars, concluding that research showed "conceptual understanding, computational and procedural fluency, and problem solving skills are equally important and mutually reinforce each other. Debates regarding the relative importance of each of these components of mathematics are misguided."
The Panel's final report met with significant criticism within the mathematics education community for, among other issues, the selection criteria used to determine "high-quality" research and the amount of focus placed on algebra.
- ^ a b Preliminary Report, National Mathematics Advisory Panel, January 2007
- ^ Reform Mathematics vs. The Basics: Understanding the Conflict and Dealing with It, John A. Van de Walle Virginia Commonwealth University; "Debate has degenerated to 'math wars'"
- ^ A quarter century of US 'maths wars' and political partisanship, David Klein, California State University
- ^ "Which Curriculum Is Most Effective in Producing Gains in Students' Learning?". http://www.nctm.org/news/content.aspx?id=12324.
- ^ Preliminary Report, National Mathematics Advisory Panel, January, 2007
- ^ Also known as Fuzzy Math"
- ^ Public statement on math reform
- ^ Intervention: Everyday Mathematics
- ^ [http://ies.ed.gov/ncee/wwc/reports/elementary_math/sesm/ Intervention: Saxon Elementary School MathIntervention: Saxon Elementary School Math]
- ^ a b c Curriculum Focal Points, NCTM
- ^ Chicago Sun Times "Fuzzy teaching ideas never added up" September 13, 2006
- ^ Letter to the New York Times, Francis Fennell
- ^ http://www.ed.gov/about/bdscomm/list/mathpanel/factsheet.htmlNational Mathematics Advisory Panel: Strengthening Math Education Through Research,
- ^ http://www.ed.gov/about/bdscomm/list/mathpanel/index.htmlFoundations of Success: The Final Report of the National Mathematics Advisory Panel. March 2008. p. 45."
- ^