AT THE POST OFFICE
Multiply any 2-figure numbers together by mere mental arithmetic!
If you want 21 stamps at 26 cents each you can
easily find the total price in your head.
There were no carries in the method given before.
However, this only involves one small extra step.
- 21 x 26 = 546
The method is the same as before
except that we get a 2-figure number, 14, in the
middle step, so the 1 is carried over to the left
(4 becomes 5).
So 21 stamps cost $5.46.
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At The Post Office (1)
- 33 x 44 = 1452
There may be more than one carry:
Vertically on the left we get 12.
Crosswise gives us 24, so we carry 2 to the left
and mentally get 144.
Then vertically on the right we get 12 and the 1
here is carried over to the 144 to make 1452.
At The Post Office (2)
Any two numbers, no matter how big, can be
multiplied in one line by this method.