AT THE OFFICE

Show your colleagues in the office this beautiful method for multiplying numbers where the first figures are the same and the last figures add up to 10.

• 32 x 38 = 1216

figures (2 and 8) add up to 10.

So we just multiply 3 by 4 (the next number up)
to get 12 for the first part of the answer.

And we multiply the last figures: 2 x 8 = 16 to
get the last part of the answer.

Diagrammatically:

• And 81 x 89 = 7209

We put 09 since we need two figures as in all the other examples.

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At The Office

The mathematician
does not study pure
mathematics because
it is useful; he studies
it because he delights
in it and he delights in it
because it is beautiful.
POINCARÉ