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87 + 179

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mastered

87 + 179

266

First, add the digits other than the units, 80 + 170 = 250. Remember that for a moment. Now, add the one's digits, 7 + 9 = 16. Now, add the 16 to the 250 to get 266. ---- Alternately, subtract one from 87 and give it to 179, so we have 86 + 180 = 266.

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