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submitted 9 hours ago by [email protected] to c/[email protected]
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[-] [email protected] 17 points 9 hours ago* (last edited 9 hours ago)

Only if you weren't taught (or were, but too long ago lol) the divisible by 3 rule - if the sum of the digits is divisible by 3, so is the whole number. 5+1=6 therefore 51 is divisible by 3! Bonus division rule - if it was also an even number and therefore divisible by 2, you could deduce that the whole number was divisible by 6.

[-] [email protected] 4 points 8 hours ago

Actually, 51 is not divisible by 3!

It is divisible by 3

this post was submitted on 22 Sep 2024
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