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
Both numbers here start with 3 and the last
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.
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
