AAA Math
Explanations of math topics, practice problems, and challenging games organized by topic and grade level.

Ask Dr. Math
Swarthmore College math students answer questions on all levels, k-12.  Includes archives.

Brain Teasers
Test your wits each week with a new math puzzle then come back the following week to see how smart you are!

Coolmath.com
Work on basic math skills, play math-related games and explore new math concepts at this interactive site.

Create-a-Graph
Use this National Center for Education Statistics site to create line, bar, area and pie graphs.

Figure This! Math Challenges for Families
Mathematical challenges for families or classrooms geared to middle-school students.

Math Cats
Explore math concepts through games, crafts and interactive projects.

Math League Help Topics
A math help resource for grades 4–8.

Maths Dictionary for Kids
Over 500 math terms are presented in this interactive dictionary.

Online Conversion.com
Convert weights and measurements, angles, speed and more.

Webmath
This site is composed of many math "fill-in-forms" into which you can type the math problem you're working on. Linked to these forms is a set of math-solvers that can instantly analyze your problem, and when possible, provide a step-by-step solution.