Mental addition - add a 2-digit and a 1-digit number (with regrouping)
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YouTubeMath Mammoth
Mental addition - add a 2-digit and a 1-digit number (with regrouping)
I teach several strategies for adding mentally a two-digit and a single-digit number. For example, to add 38 + 7, we can add 8 + 7 = 15, and lastly add 30 and 15. Another way to think about the same is that since the sum of 8 + 7 goes five OVER the next ten, then the sum of 38 + 7 also goes five over the following ten - which is 40 in this case ...
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