Grades 2 & up. 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 fractions, decimals and percentages. Denominations include 1, 1/2, 1/3, 1/4, 1/5, 1/8, 1/10, and 1/12. Each set contains 51 plastic tiles in a sturdy plastic storage tray and an activity guide. Storage tray measures 10"L x 9"H.