(www.cut-the-knot.org/content.shtml)

Grades 4-12, with parental supervision

This ad-supported website offers a vast array of interactive math puzzles, lessons, and activities geared to those who have mastered basic arithmetic and are studying algebra, geometry, probability, etc.

When you get to the site you will see a brief introduction in the center of the page. Scroll below it to a menu that includes links to activities in the following areas:

- Arithmetic
- Algebra
- Math Games & Puzzles
- Logic
- Fractals & Chaos
- Calculus
- Geometry
- Probability
- Computer Math Magic
- Visual Illusions
- And much more!

Click on any one of interest and a new page opens with instructions and interactives.

Students studying middle school math and beyond will have no problem navigating this site and enjoying the activities on their own.

Note: Because the site contains many randomly generated advertising banners and buttons, parents (as always) should preview the site and supervise Internet access.