Use snacks to create number groups that equal up to 20.
Count to 20 with your child. Provide small items such as raisins, nuts or jellybeans. Help your child count out up to 20 items, and separate them into two groups. Write an equation that shows the amounts in each group, as well as the sum. Together, find and record all the combinations you can make for the sum of 20, 19, 18 and so on.