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 100 Plastic Units, 30 Rods, 10 Flats, 1 Cube and Activity Book. For use with 3-4 students.