During this unit, your child will synthesize many of the skills he has developed during previous units as he uses these skills to add and subtract within 100. The lessons break these skills down into specific sub-skills, including adding a two-digit number and a multiple of ten and adding a one-digit number to a two-digit number. While the unit incorporates a range of materials that are familiar to your child, a particular focus is on developing mental math strategies and relying less on the concrete materials. For the final project, your child will create a Go Fish! card game by creating number sentences to represent target sums within 100.