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kescusay@lemmy.world

Struggling with the nine times table? I have a failsafe method (www.theguardian.com)

submitted 1 day ago by Aatube@lemmy.dbzer0.com to c/nottheonion@lemmy.world

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Apparently, nines are the hardest to grasp for primary school children. If only they’d learned how to cheat like me, says Adrian Chiles

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[–] BradleyUffner@lemmy.world 3 points 2 hours ago* (last edited 2 hours ago) (1 children)

9s have always been easy for me. Subtract 1 from the other number to get the first digit of the answer, the second digit is whatever digit you would add to the first to make 9.

For 9x6
6-1=5
5+4=9
So the answer is 54.

It happens so fast in my head that I barely even have to think about it.

[–] Sylvartas@lemmy.dbzer0.com 2 points 2 hours ago

I just did X*10-X

6x9 = 60, 60-6= 54.