30 + 90 = 120
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10 + 0 =10 ?
Round the highest and lowest numbers. 25 - 5 = 20
Round the highest and lowest numbers. 25 - 5 = 20
841 would round down to 840 and 362 would round down to 360. So 840+360=1200. The sum is about 1200.
Your sum might be less than fifty and you would rather round to forty than zero.