This unique set of 10 base ten flats 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 1 x 10 x 10 cm flats are washable and durable for years of hands-on activities. For use with Interlocking Base Ten Units, Rods and Cube.