Вчислите. 400*600 = 120*80 = 16*20 = 15*18 = 710*4 = 280*8 = 315:35 = 210:42 = 486:81 = 84:24 = 360:72 = 240:60 = 140:70 = 360:90 = 2400:200 = 1800:900 = 12*30 = 16*25 = 18*14 = 360:60+140

1) 400 * 600 = 240,000;

2) 210 : 42 = 5;

3) 486 : 81 = 6;

4) 84 : 24 = 3,5;

5) 360 : 72 = 5;

6) 240 : 60 = 4;

7) 140 : 70 = 2;

8) 360 : 90 = 4;

9) 2,400 : 200 = 12;

10) 1800 : 900 = 2;

11) 12 * 30 = 360;

12) 16 * 25 = 400;

13) 18 * 14 = 252;

14) 360 : 60 + 140 = 6 + 140 = 146;

Делали деление и к результату прибавили 140.