19*3=57
Второй способ:
10*3=30, 9*3=27, 30+27=57
16*4=64
10*4= 40, 6 * 4=24,40+24=64
234*2=468
200*2= 400, 34*2 = 68, 400+68=468
317*3=951
Второй способ;
300 * 3= 900, 17*3=51
14*4=56
2)
10*4= 40, 4*4= 16
24*3=72
20*3=60, 4*3=12
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19*3=57
Второй способ:
10*3=30, 9*3=27, 30+27=57
16*4=64
Второй способ:
10*4= 40, 6 * 4=24,40+24=64
234*2=468
Второй способ:
200*2= 400, 34*2 = 68, 400+68=468
317*3=951
Второй способ;
300 * 3= 900, 17*3=51
14*4=56
2)
10*4= 40, 4*4= 16
24*3=72
2)
20*3=60, 4*3=12