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“You might know the answers to most of the fact problems, but you might not know the answers to problems with larger numbers,” said Mrs. Dewey. “Let's try some problems with factors larger than 10, like 5 14. I think the break-apart method can help you with those problems.”
Rosa found 5 14 by breaking apart the 14. One part was 10.
5 14 = 5 10 + 5 4
= 50 + 20
= 70
Mark found 5 14 by breaking the 14 into two equal parts.
5 14 = 5 7 + 5 7
= 35 + 35
= 70
Practice the break-apart method with larger numbers on the Break Apart and Multiply pages in the Student Activity Book.