Did you know in the UK a quart is smaller than in America? This explains why a standard unit of measure is necessary for volume. Young scientists learn the similarities and differences between five different units used to measure volume....

In this right angles worksheet, student properly place seventeen words in a grid.  The words may each make one right angle turn somewhere along its length.  Solutions are provided.

In this cards puzzle, students arrange cards in a four by four grid so that similar cards are not in the same row, diagonal, or column.  Two known possible solutions exist.

This is a demo version of the game with two modes of play. In one, you must place number tiles on a grid so that the tiles touching it add up to that number. In the second mode, you solve number puzzles. Be sure to read the instructions...