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71.

My method:

52 + 19 = 52 + (20 - 1) = (52 + 20) - 1 = 72 - 1 = 71

Of course, I do not go through each step!

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โˆ™ 2013-04-21 20:26:22
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Algebra

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Q: What is 52 plus 19 using mental math?
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