1) 75 + 65 = 140, 140 : 10 = 14
2) 230 - 70 = 160, 160 * 3 = 480
3) 1 час = 60 мин., 60 - 29 = 31 мин.
4) 640 : 4 = 160
5) 120 * 7 = 840
6) 230 * 4 = 920
7) 2500 : 50 = 50
8) 880 : 11 = 80, 5 * 2 = 10, 80 : 10 = 8
9) 280 : 2 * 1 = 140
10) 60 + 100 = 160, 160 : 2 * 1 = 80