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• Author or Editor: Enrique Ortiz
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## The Secret Life of Prime Numbers

It's not magic. By color-coding different combinations of factors, students can learn to use this system to “guess” unknown, randomly selected integers and composites.

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## The Beauty of Mathematics and Art

This article includes an original artwork using geometry. Art such as this can foster understanding and appreciation of fundamental concepts across fields.

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## The Shape of Art: Mathematics Connections

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## The Roll Out Fractions Game: Comparing Fractions

This game provides for students' development of the use of models, benchmarks, and equivalent forms to judge the size of fractions in a motivational and flexible way. Teachers will learn to use this game to present fractions in an innovative way.

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## A Game Involving Fraction Squares

Fractions are a major area of concept and skill study in elementary school mathematics. The game in this article helps students practice many of these concepts and skills in a motivational and informal setting. The major concepts covered by this game include identifying fractions, equivalent fractions, and improper fractions; performing operations with fractions; and reading and writing numerals for fractions. This game also helps develop number sense and uses models to explore operation sense with fractions. The emphasis is on developing and understanding fraction concepts and operations.

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## It's a Girl! Random Numbers, Simulations, and the Law of Large Numbers

Modeling using mathematics and making inferences about mathematical situations are becoming more and more prevalent in most fields of study. When we want to generalize about a population or make predictions of what could occur, we cannot use descriptive statistics. Instead, we turn to inference. Simulation and sampling are essential in building a foundation for statistical inference.

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## A Teacher's Journal: Geometry Game

Geometry is a very important part of the elementary school curriculum. NCTM's Curriculum and Evaluation Standards for School Mathematics (1989) indicates that geometry helps us represent and describe in an orderly manner the world in which we live. Children are naturally interested in geometry and find it intriguing and motivating.

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## Produce Intrigue with Crypto!

Introduce students to matrices while they encode, decode, and pass secret messages in math class.

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## Perimeter and Beyond

A simple problem-solving exercise encourages teachers to “start small” to reveal how third graders understand multiple math concepts simultaneously.

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## Get the Goof!

Try introducing this easy-to-implement strategy that engages student detectives in error analysis and mathematical discourse.