These easy-to-manipulate disks provide hands-on practice for developing number sense. Colour-coded according to place value, the foam disks 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 is the same as repeated subtraction. A re-sealable poly bag plus instruction sheet included. Disks measure 2.5cm in diameter. Set of 100.