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Paoletti, Teo; Monahan, Ceire; Vishnubhotla, Madhavi – Mathematics Teacher, 2017

GeoGebra is a free tool that has the potential to change both how and what is taught in mathematics. GeoGebra allows teachers and students to explore various mathematical ideas either through the full applet (https://www.geogebra.org/graphing) or by sharing applets via GeoGebra's Materials site (https://www.geogebra. org/materials/). It has many…

Descriptors: Computer Oriented Programs, Mathematics Instruction, Learner Engagement, Geometry

Lee, Younhee; Lim, Woong – Mathematics Teacher, 2017

Understanding how one representation connects to another and how the essential ideas in that relationship are generalized can result in a mathematical theorem or a formula. In this article, the authors demonstrate this process by connecting a vector cross product in algebraic form to a geometric representation and applying a key mathematical idea…

Descriptors: Mathematics Education, Geometric Concepts, Algebra, Mathematical Formulas

Wagner, Jennifer; Sharp, Janet – Mathematics Teacher, 2017

Calculus, perhaps more than other areas of mathematics, has a reputation for being steeped with procedures. In fact, through the years, it has been noticed of many students getting caught in the trap of trying to memorize algorithms and rules without developing associated concept knowledge. Specifically, students often struggle with the…

Descriptors: Calculus, Mathematics Instruction, Mathematical Concepts, Concept Formation

McGraw, Rebecca – Mathematics Teacher, 2017

The task shared in this article provides geometry students with opportunities to recall and use basic geometry vocabulary, extend their knowledge of area relationships, and create area formulas. It is characterized by reasoning and sense making (NCTM 2009) and the "Construct viable arguments and critique the reasoning of others"…

Descriptors: Mathematics Education, Geometric Concepts, Mathematical Formulas, Mathematics Skills

Harper, Suzanne R.; Cox, Dana C. – Mathematics Teacher, 2017

In the authors' attempts to incorporate problem solving into their mathematics courses, they have found that student ambition and creativity are often hampered by feelings of risk, as many students are conditioned to value a produced solution over the actual process of building one. Eliminating risk is neither possible nor desired. The challenge,…

Descriptors: Problem Solving, Mathematics Instruction, Student Motivation, Creativity

Szydlik, Jennifer Earles; Parrott, Amy; Belnap, Jason Knight – Mathematics Teacher, 2016

Classroom culture is negotiated and established through both conversations and practices. Traditionally, teachers and researchers have focused primarily on the individual and social construction of mathematical content--that is, students' conceptual understanding and procedural skills--through mathematical actions and practices. This article…

Descriptors: Mathematics Instruction, Geometry, Discussion (Teaching Technique), Definitions

Ghosh, Jonaki B. – Mathematics Teacher, 2016

Generalizing is a foundational mathematical practice for the algebra classroom. It entails an act of abstraction and forms the core of algebraic thinking. Kinach (2014) describes two kinds of generalization--by analogy and by extension. This article illustrates how exploration of fractals provides ample opportunity for generalizations of both…

Descriptors: Mathematics Instruction, Grade 11, Secondary School Mathematics, Algebra

Koyunkaya, Melike Yigit; Kastberg, Signe; Quinlan, James; Edwards, Michael Todd; Keiser, Jane – Mathematics Teacher, 2015

Right triangles play a significant role in mathematics. In this favorite lesson, the authors help students understand variant and invariant properties by considering relationships among angle measures and side lengths in right triangles. Students explore these relationships using interactive mathematics software, changing one angle and observing…

Descriptors: Mathematics Instruction, Geometric Concepts, Computer Software, Mathematics Activities

Cupillari, Antonella – Mathematics Teacher, 2015

Practical problems that use mathematical concepts are among the highlights of any mathematics class, for better and for worse. Teachers are thrilled to show applications of new theoretical ideas, whereas most students dread "word problems." This article presents a sequence of three activities designed to get students to think about…

Descriptors: Mathematical Concepts, Word Problems (Mathematics), Mathematics Activities, Geometric Concepts

DeJarnette, Anna F.; Rosado Lausell, Sahid L.; González, Gloriana – Mathematics Teacher, 2015

How can geometry teachers design great tasks that allow students to make connections among interrelated concepts and expand their geometric reasoning skills? Many curricular materials provide problems for students to apply a single geometric concept. However, these problems do not always promote reasoning opportunities for students, because…

Descriptors: Geometry, Geometric Concepts, Task Analysis, Mathematics Activities

Hsiao, Joy – Mathematics Teacher, 2015

Paper folding, or origami in Japanese, is a traditional craft that has been enjoyed by both children and adults for hundreds of years. Mathematicians have long studied the mathematics of paper folding. They use square papers to construct mathematical shapes (for example, folding an equilateral triangle from a square paper or trisecting an angle),…

Descriptors: Handicrafts, Geometric Concepts, Geometry, Problem Solving

Manizade, Agida G.; Mason, Marguerite M. – Mathematics Teacher, 2014

A mathematics classroom that reflects the vision of NCTM's "Principles and Standards for School Mathematics" will have the teacher posing problems, asking questions that build on students' thinking, and encouraging students to explore different solutions. In teaching about area, it is not sufficient to give students the…

Descriptors: Geometric Concepts, State Standards, Academic Standards, Problem Solving

Moore, Kevin c.; LaForest, Kevin R. – Mathematics Teacher, 2014

How do students think about an angle measure of ninety degrees? How do they think about ratios and values on the unit circle? How might angle measure be used to connect right-triangle trigonometry and circular functions? And why might asking these questions be important when introducing trigonometric functions to students? When teaching…

Descriptors: Trigonometry, Mathematics Instruction, Mathematical Concepts, Mathematical Logic

Viro, Julia – Mathematics Teacher, 2014

Constructing viable arguments and reasoning abstractly is an essential part of the Common Core State Standards for Mathematics (CCSSI 2010). This article discusses the scenarios in which a mathematical task is impossible to accomplish, as well as how to approach impossible scenarios in the classroom. The concept of proof is introduced as the…

Descriptors: Mathematics Instruction, Mathematical Concepts, Validity, Mathematical Logic

Berger, Lisa – Mathematics Teacher, 2013

Must two triangles with equal areas and equal perimeters also be congruent? This question was introduced in "Mathematics Teacher" ("MT")by Rosenberg, Spillane, and Wulf in their article "Heron Triangles and Moduli Spaces" (2008), which also described the authors' subsequent investigation of a particular moduli…

Descriptors: Mathematics Instruction, Mathematical Concepts, Geometric Concepts, High Schools