In this introduction to polygons, a triangle convinces a shapeshifter to make him a quadrilateral and later a pentagon, but discovers that where angles and side

The creative examples, simple text, and art in this series help students learn primary math concepts.

From 1 to 10, these "lessons that count" are math magic for learning addition and subtraction. Greg Tang has built his career as an author and math missionary o

In ancient Greece, young Pythagoras discovers a special number pattern (the Pythagorean theorem) and uses it to solve problems involving right triangles.

Persistence and creativity can lead to amazing things, as Leif the leaf discovers in this lovely storybook from Allison Sweet Grant and Adam Grant, the #1 New Y