Because your child is learning to count to high numbers by now, you can practice skip counting. Start by trying to count by 10s to 100. Then try counting by fives or twos. The more you play ...

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.