ADDITION AND SUBTRACTION TO 18: Unit 3 provides 19 days of learning in which the child continues to explore and review addition and subtraction to 18. Using a variety of strategies, with and without the support of manipulatives, the child models addition and subtraction, creates and solves problems, and records the process symbolically. The child explores and uses mental math strategies such as making 10, using doubles, related facts, one more and one less, and two more and two less. Also covered are the effects of adding or subtracting zero and importance of the number order when adding and subtracting.
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