93×4=(90+3)×4+3×4=360+12=37278×2=(70+8)×2+8×2=140+16=156316×3=(300+16)×3+16×3=900+48=948185×5=(100+80+5)×5+80×5+5×5=925+400+25=1350
93×4=(90+3)×4+3×4=360+12=372
78×2=(70+8)×2+8×2=140+16=156
316×3=(300+16)×3+16×3=900+48=948
185×5=(100+80+5)×5+80×5+5×5=925+400+25=1350