These easy-to-manipulate magnetic discs provide whole group demonstration developing number sense. Color-coded according to place value, the magnetic foam discs allow teachers (or students) to demonstrate on any magnetic board while students visually track what happens when numbers regroup 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 reusable storage box. Magnetic foam discs are 2" in diameter and made of EVA foam with magnetic backing for easy grip and movement. 20 each of 4 values—1, 10, 100, and 1,000. 80 total jumbo magnetic foam discs in set.