jakey's great math's progres

1.4x35=(4x30)+(4x5)
120+20
=140



2.3x39=(3x40)
120-3
117


18.08.11

8x1=18
8x2=16
8x3=24
8x4=32
8x5=40
8x6=48
8x7=56
8x8=64
8x9=72
8x10=80