
This can be used as a count down as well.
May 29, 2008

December 11, 2007

This stopwatch records times as you click the mouse.
November 16, 2007

Work out how many cubes you need to make different prisms
November 15, 2007

This activity demonstrates how to measure area and perimeter.
November 6, 2007

Find the area of rectangles on a grid. Explore how the formula works for finding a rectangle’s area. First, estimate the area of a chosen [...]
October 30, 2007

Select from three levels of complexity for working with polygons. Estimate the area of a randomlygenerated polygon. Try counting squares on a [...]
October 30, 2007