Fourth Grade Challenging Math------------------------------------------------------------------------------ 4-47) Answer a) 261 b) 170
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4-47) Answer
a) 57 + 16 + 61 + 84 + 43 = (57 + 43) + (16 + 84) + 61 = 100 + 100 + 61 = 261b) 39 + 73 + 41 + 17 = (39 + 41) + (73 + 17) = 80 + 90 = 170
