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52 + 49

101

First, add the tens digits, 50 + 40 = 90. Remember that for a moment. Now, add the one's digits, 2 + 9 = 11. Now, add the 11 to the 90 to get 101. ---- Alternately, subtract one from 52 and give it to 49, so we have 51 + 50 = 101.

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