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How does Common Core suggest that first graders solve the problem 6 + 7?

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The Common Core math standards require first graders to "think of whole numbers between 10 and 100 in terms of tens and ones" and solve problems such as "6 + 7" by "creating equivalent but easier or known sums" like this: "6 + 6 + 1 = 12 + 1 = 13."

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