by Caroline Eidson, Ph.D., and Lizette Zeren, M.S.
This unit introduces counting, representing, ordering, and comparing numbers 1 through 20. It also presents number concepts and skills that your child will use in subsequent units, such as creating number bonds, making 10, and skip counting by 2s and 5s. Your child will work with a range of materials, including number lines and an abacus, that will be used again in other units. The final project asks your child to create a game to share what he's learned over the course of the unit.