Strategies for mental math: add in parts & use a known fact
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YouTubeMath Mammoth
Strategies for mental math: add in parts & use a known fact
I explain two basic strategies for mental addition, using several examples. The first one is that of adding in parts. For example, to add 36 + 47, we can add 30 and 40, and 6 and 7. Since 6 + 7 = 13, this problem becomes 30 + 40 + 13, which is easier than the original. Another strategy is to use a fact you already know to solve a similar ...
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