Trying to memorize the holes in my #multiplication tables & realized that 1-digit times 9 is:

digit-1 for tens space
10-digit for ones space

1x9 works as 1-1 (so 00) and 10-1 (so 9) or 0+9 for 9.

2x9 is 2-1 (so 10) and 10-2 is 8, so 10+8 for 18.

3x9 is 3-1 (2) so 20, and 10-3 is 7 so 27

4x9 is 4-1 (3) so 30, and 10-4 is 6 so 36

etc

Works for 2-digit times 9 as well, but you subtract the diff between digit and 10.

12x9 is 12-1*10 (110) and 12 is 2 above 10 so -2 so 110-2 or 108

#math

"Can you quadruple the production of thingies?"

"Multiply by four? Sir, yes, sir. You bet I can, sir!"

"How many thingies are we making now?"

"None, Sir!"

#multiplication #joke

#multiplication : commonly, the process of ascertaining by a briefer computation the result of such repeated additions

- French: Multiplication

- German: die Multiplikation

- Italian: multiplicazione

- Portuguese: multiplicação

- Spanish: multiplicación

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Multiplier par un nombre à 2 chiffres

https://tube.reseau-canope.fr/w/mMMAMAMPVJKYyZiCXgkzme

#multiplication : commonly, the process of ascertaining by a briefer computation the result of such repeated additions

- French: Multiplication

- German: die Multiplikation

- Italian: multiplicazione

- Portuguese: multiplicação

- Spanish: multiplicación

------------

Thank you so much for being a member of our community!