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80 + 30 then add 80 + 30=110 then add the numbers you left out 3+ 4 = 7 and you get 117
or you can round up 90 + 40 90 + 40=130 then you subtract the numbers you added on 90 - 83 = 7 40 - 34 = 6 then you add those and subtract from 130 and you get 11Answer here
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