Read the Notes for the rules on how to play. A whole class game for revising defintions. This version reviews definitions for terms associated with number concepts such as denominator, multiple, etc. The words can be easily changed.

Choose 3 large numbers and 3 small numbers, and then choose a random target. How many ways can you find to use the small numbers plus some operations and brackets to make an expression that equals the target?

And start the clock when there are only 30 seconds left.

A triangle is made up of four pieces. Move the pieces around to make a new congruent triangle. Except the new triangle is missing one square unit! Where did it go?

Your calculator is missing some of its keys! Which answers can you still get?
Six levels, from easy to challenging!

Alphametics are arithmetic puzzles in which each letter represents a different digit. Use your knowledge of place value and numbers to solve the puzzle.

This is a really cool interactive applet for demonstrating Newton's Method.
http://www.math.umn.edu/~garrett/qy/Newton.html

And here is one from the same website that shows a 'pathelogical' case, where the iterations don't converge on the nearest solution:
http://www.math.umn.edu/~garrett/qy/BadNewton.html

And here are six animated gifs that illustrate Newton's Method. Not interactive, but very nice nonetheless:
http://math.fullerton.edu/mathews/a2001/Animations/RootFinding/NewtonMet...

The above animations are part of a website that shows animations of a variety of iterative methods of finding zeros:
http://math.fullerton.edu/mathews/a2001/Animations/RootFinding/RootFindi...

Use a spreadsheet to find out how long it will take the classes to save 1,000,000 pennies. From The Math Forum POW.

An Activboard flipchart for the classic game of Nim. Players take turns removing chips from one row of the board. The winner is the person who chooses the last chip.

Hint: do you know your binary numbers?

This is a flipchart with many interactive pages. You may need to become a member (its free!) of the Promethean Planet forum to access it.
http://www.prometheanplanet.com/us/server/show/ConResource.337

Go here to become a member of the USA Promethean Planet Forum:
http://www.prometheanplanet.com/us/server/show/nav.802

A flipchart that gives you access to an unlimited number of graphs, tables and yellow stickies.