Răspuns:
12×40=12x(4x10)=480
12x400=12x(4x100)=4800
22x80=22x(8x10)=1760
11x800=11x(8x100)=8800
46x30=46x(3x10)=1380
28x300=28x(3x100)=8400
65x50=65x(5x10)=3250
15x500=15x(5x100)=7500