450 - 30 Х 4 + 70 :10 = 323
1) 70 :10 = 7
2) 30 Х 4 = 120
3) 7 + 120 = 127
4) 450 - 127 = 323
280 : 7 + 160 х 5 + 70 = 910
1) 280 : 7 = 40
2) 160 х 5 = 800
3) 800 + 70 = 870
4) 40 + 870 = 910
650 + 350 - 80 : 2 х 5 = 992
1) 2 х 5 = 10
2) 80 :10 = 8
3) 350 - 8 = 342
4) 650 + 342 = 992
180 + 20 х 6 - 75 : 25 = 297
1) 75 : 25 = 3
2) 20 х 6 = 120
3) 120 - 3 = 117
4) 180 + 117 = 297