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kescusay@lemmy.world

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

submitted 9 hours ago by Aatube@lemmy.dbzer0.com to c/nottheonion@lemmy.world

15 comments fedilink hide all child comments

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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[–] ChonkyOwlbear@lemmy.world 18 points 8 hours ago (1 children)

The trick I was taught is that the sum of all two digit multiples of nine add up to nine. Then you just take the number you want to multiply times none and subtract 1.

For example if you want to multiply times 8, the tens place is 7 and the ones place must add up to 9, so 2. 7+2=9, so 9x8=72.

[–] markz@suppo.fi 7 points 7 hours ago (2 children)

Isn't it easier to just do 80 - 8

[–] queerlilhayseed@piefed.blahaj.zone 5 points 7 hours ago

not for me. I do the "adds up to 9" trick to this day.

[–] ChonkyOwlbear@lemmy.world 1 points 6 hours ago

The method I'm talking about only adds/subtracts single digit numbers, which is easier for kids.