With these color-coded tiles, students can manipulate parts of a whole to see how they relate to each other. Use the tiles to perform simple math operations with percentages. Each set contains 51 plastic tiles in a sturdy plastic storage tray. Includes percent values of 100%, 50%, 33.3%, 25%, 20%, 16.6%, 12.5%, 10%, 8.3%. Activity Guide provides suggestions for use alone or with other Rainbow Fractionr Teaching System products. Tray measures 10"L x 9"H.