anton's great math progress

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



2.3x39=
(3x30)+(3x9)
90 + 27=
117


1.9.11

741/4x3=12
4x4=16
4x5=20
4x6=24
4x7=28
4x8=32
4x9=36




14.11.11

2-3rds of 21 =14