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[-] letsgo@lemm.ee 8 points 1 year ago

There are tricks like that for a lot of numbers. For 7, chop off the last digit, double it and add it to what's left. Repeat as required. If the result is divisible by 7 then the original number was. eg: 356 -> 35+12=47 not db7. 357 =>35+14 both db7 so we don't even need to do the add.

[-] diverging@lemmy.ml 3 points 1 year ago

double it and ~~add it to~~ subtract it from what’s left

[-] BruceDoh@sh.itjust.works 1 points 1 year ago
[-] sockenklaus@sh.itjust.works 3 points 1 year ago

You clearly mean:

14: 1 + 8 = 9 (not db 7)

Someone else in this thread correctly stated:

"Chop of last digit, double it and subtract from what is left"

14: 1 - 8 = -7. (dB 7!)

Math is awesome, I didn't know this trick!

[-] BruceDoh@sh.itjust.works 1 points 1 year ago

Yes, that's what I meant. The subtract rule works.

this post was submitted on 22 Oct 2023
1264 points (96.3% liked)

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