Grade PreK-2. A must have for teaching fractions! Set contains blocks in proportionally sized shapes. The smaller shape is 1/4 the size of the corresponding large shape (large square measures 2-15/16 in. x 2-15/16 in.). Set of 60 solid plastic blocks comes in an assortment of 5 shapes, 3 colors, 2 sizes, and 2 thicknesses. Comes in a durable sorting and storage tray.