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Base Ten Blocks provide students with fun, hands-on ways to learn place value, number concepts, operations, and measurement! This manipulative set contains 400 units, 200 rods, 40 flats, and 4 cubes. Also includes 25 place value mats, the Base Ten Revised Edition Activity Book, and a base ten virtual manipulative. Everything is packaged in 4 storage containers inside a 4-unit storage center. Designed for grades 3-6, there are enough materials to support 20-25 students.