this post was submitted on 22 Oct 2023
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Lemmy Shitpost

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[–] [email protected] 30 points 1 year ago (15 children)

Any number where the individual digits add up to a number divisible by '3' is divisible by 3.

51 = 5+1 = 6, which is divisible by three.

Try it, you'll see it always works.

[–] [email protected] 9 points 1 year ago (6 children)

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.

[–] BruceDoh 1 points 1 year ago (1 children)
[–] sockenklaus 3 points 1 year ago (1 children)

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 1 points 1 year ago

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

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