Place Value Cards allow children to see the value of each digit within a number. The small numbers in the upper left-hand corners of the cards shows the expanded notation to remind children that the โ3โ is really worth a โ30.โ The back of each card shows the Rekenrek's (aka MathRack) visual representation of each number, to help children build spatial relationships for numbers. A set contains one card each of the numbers 1-9, the decade numbers (10, 20, 30โฆ), and a 100 card. This allows chil