1) 87+139+213+61 = (87 + 213) + (139 + 61) = 300 + 200 = 500;
2) 368+73+27+132 = (368 + 132) + (73 + 27) = 500 + 100 = 600;
3) 596+122+17+104+78 = (596 + 104) + (122 + 78) + 17 = 700 + 200 + 17 = 917;
4) 28+65+454+135+46 = 28 + (65 + 135) + (454 + 46) = 28 + 200 + 500 = 728.
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1) 87+139+213+61 = (87 + 213) + (139 + 61) = 300 + 200 = 500;
2) 368+73+27+132 = (368 + 132) + (73 + 27) = 500 + 100 = 600;
3) 596+122+17+104+78 = (596 + 104) + (122 + 78) + 17 = 700 + 200 + 17 = 917;
4) 28+65+454+135+46 = 28 + (65 + 135) + (454 + 46) = 28 + 200 + 500 = 728.