Răspuns:
a)2x248=2(200+40+8)=2x200+2x40+2x8=400+80+16=496
4x232=4(200+30+2)=4x200+4x30+4x2=800+120+8=928
b) 7x137=7(100+30+7)=7x100+30x100+7x7=700+300+49=1049
6x164=6(100+60+4)=6x100+6x60+6x4=600+120+24=744
c)8x107=8(100+7)=8x100+8x7=800+56=856
3x308=3(300+8)=3x300+3x8=900+24=924
