곱셉법2

Multiplying a number by 11.

To multiply any 2-figure number by 11 we just put
the total of the two figures between the 2 figures.

• 26 x 11 = 286

  Notice that the outer figures in 286 are the 26
  being multiplied.

  And the middle figure is just 2 and 6 added up.

• So 72 x 11 = 792

77 x 11 = 847

This involves a carry figure because 7 + 7 = 14
we get 77 x 11 = 7₁47 = 847

234 x 11 = 2574

We put the 2 and the 4 at the ends.
We add the first pair 2 + 3 = 5.
and we add the last pair: 3 + 4 = 7.