This rectangle covers 15 squares so it has an area of 15 cm 2. To find the exact area of a shape, count the whole squares and half squares. There are eight whole squares = 8 cm 2 and seven half ...

At the end of each row is a multiple of ten. You can use the 100 square to count from 1 to 100 and to count from 100 to 1. You can also use it to spot patterns in the numbers up to 100.