Website
National Council of Teachers of Mathematics

The Math Forum: Multiplying Magic Squares

For Students 6th - 8th
The math concept of "Magic Squares" is explored here with basic terminology and examples to begin with. Once students have mastered these, the more challenging idea of how to multiply magic squares is introduced. Review materials are...
Website
Cut the Knot

Cut the Knot!: Interactive Mathematics: Geometry Articles, Theorems, Problems

For Students 9th - 10th
Contains over five hundred Geometry articles, problems, puzzles, and games. Some sites relating to circles are provided within this list.

Other popular searches