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And 299999999 is divisible by 13 (lemmy.world)

submitted 1 month ago by [email protected] to c/[email protected]

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[–] TwilightKiddy 87 points 1 month ago (11 children)

The divisability rule for 7 is that the difference of doubled last digit of a number and the remaining part of that number is divisible by 7.

E.g. 299'999 → 29'999 - 18 = 29'981 → 2'998 - 2 = 2'996 → 299 - 12 = 287 → 28 - 14 = 14 → 14 mod 7 = 0.

It's a very nasty divisibility rule. The one for 13 works in the same way, but instead of multiplying by 2, you multiply by 4. There are actually a couple of well-known rules for that, but these are the easiest to remember IMO.

[–] [email protected] 63 points 1 month ago (1 children)

Thanks I hate it

[–] [email protected] 9 points 1 month ago

This math will not stand man!

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