These easy-to-manipulate discs provide hands-on practice for developing number sense. Color-coded according to place value, the foam discs allow students to visually track what happens when they regroup numbers in both addition and subtraction. And they help illustrate that multiplication is the same as repeated addition, and division the same as repeated subtraction. Packaged in re-sealable poly bag for easy storage. Discs are 1" in diameter, 1/8" thick, and made of EVA foam for easy manipulation and quiet classroom activity. Each pack includes 1500 Sensational Math™ Place Value Discs: 500 ones, 500 tens, 300 hundreds, and 200 thousands. Recommended age 6-10 years