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68 + 369

437

First, add the digits other than the units, 60 + 360 = 420. Remember that for a moment. Now, add the one's digits, 8 + 9 = 17. Now, add the 17 to the 420 to get 437. ---- Alternately, subtract one from 68 and give it to 369, so we have 67 + 370 = 437.

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