Thick foam makes it easy to remove these colorful magnetic pieces from white boards. Thin layer of magnetic material adheres to whiteboards with metal backing. Giant Fraction Tiles are perfect for classroom demonstration. Set of 51 proportionally-sized, color-coded foam pieces representing a whole, halves, thirds, fourths, fifths, sixths, eights, tenths, and twelfths. The piece representing one whole measures 8” x 1”. Grades 2 and up.