This unique set of base ten components conveniently interlocks to clarify place value, estimation and operations concepts by enabling students to manipulate and visualize varying quantities with ease. More advanced students can explore spatial relationships and volume. Plastic set is washable and durable for years of hands-on activities. Great for centers or individual exploration. Boxed set features 100 units, 30 rods, 10 flats, 1 cube and 96-page Base Ten Book filled with teaching ideas.