Explain why it works
After solving, ask kids to prove their answer to a partner with a drawing, a number line or objects. "I know 13 − 5 is 8 because 8 + 5 is 13." Talking about the why builds the connections between operations.
Why it works: when kids say the precise math words, their understanding gets sharper, a recommendation of the U.S. Department of Education's elementary math guide.
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