With our INTERLOCKING BASE TEN STARTER SET teach math in a fun and exciting way! This base ten starter set includes 100 units, 30 rods, 10 flats, 1 cube, 96-page book in box. You will find that this is a great set of math manipulatives that conveniently interlocks. Use these manipulatives to help you teach math concepts, value and grouping. The use of these base ten manipulatives enables children to manipulate and visualize varying quantities. Upper grade children will explore spatial relationships and volume in a fun and hands-on way!