180+250 640-280 420-350 240+370 560-320 680-410 830-150

Question

180+250
640-280
420-350
240+370
560-320
680-410
830-150

Answer 1

180+250= 430
640-280=360
420-350=70
240+370=610
560-320=240
680-410=270
830-150=680