1) 660 : 5 + 530 = 132 + 530 = 662
2) 920 : 8 - 405 = 115 - 405 = -290
3) 750 : 2 + 317 = 375 + 317 = 692
4) 580 : 4 + 209 = 145 + 209 = 354
5) 215 : 2 - (847 - 462) = 107,5 - 385 = -277,5
6) 245 - 4 - (97 + 487) = 241 - 584 = -343
7) 670 : 5 + (76 + 376) = 134 + 452 = 586
8) 115 - 8 - (77 + 245) = 107 - 322 = -215
9) (567 - 398) - 640 : 5 = 169 - 128 = 41
10) (1000 - 876) + 355 - 2 = 124 + 355 - 2 = 479 - 2 = 477
11) (701 - 36) - 660 : 5 = 665 - 132 = 533
12) 1000 - 390 : 2 = 1000 - 195 = 805
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Answers & Comments
1) 660 : 5 + 530 = 132 + 530 = 662
2) 920 : 8 - 405 = 115 - 405 = -290
3) 750 : 2 + 317 = 375 + 317 = 692
4) 580 : 4 + 209 = 145 + 209 = 354
5) 215 : 2 - (847 - 462) = 107,5 - 385 = -277,5
6) 245 - 4 - (97 + 487) = 241 - 584 = -343
7) 670 : 5 + (76 + 376) = 134 + 452 = 586
8) 115 - 8 - (77 + 245) = 107 - 322 = -215
9) (567 - 398) - 640 : 5 = 169 - 128 = 41
10) (1000 - 876) + 355 - 2 = 124 + 355 - 2 = 479 - 2 = 477
11) (701 - 36) - 660 : 5 = 665 - 132 = 533
12) 1000 - 390 : 2 = 1000 - 195 = 805