In order to help children understand what numbers mean, it is helpful to teach them how to compare and order them. This site provides lesson plans, tips & tricks, and frequently asked questions. It's concise and easy to understand.

Use this interactive lesson to learn about fractions. You will find equivalent fractions, compare fractions, and more. Immediate feedback is given to your answers. Links to related videos.

Explore the math of worldwide food waste, with focus on percentage, in this infographic from KQED. In the accompanying classroom activity, students predict the percent of food in each of the various categories (e.g., grains, fruit, etc.)...