Use these Plastic Base Ten manipulatives to engage students in concrete demonstrations of place value and base ten concepts. Units are made of durable, washable plastic for years of hands-on activities. Great for helping students understand abstract base ten concepts, Including place value, estimation, operations, and more. Includes 600 plastic Units, 200 Rods, 20 Flats, 3 Cubes and Base Ten Blocks Activity Book. 20-25 students.