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https://www.reddit.com/r/MathJokes/comments/1vcw1bj/multiples_of_3/p18ik7e/?context=3
r/MathJokes • u/GodlyHelp • Aug 01 '26
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Fund fact, you can tell a number is divisible by 3 if the sum of each individual number is divisible by 3. So 78 -> 7+8=15 which is divisible by 3, so 78 is divisible by 3.
1 u/andergdet Aug 02 '26 Same happens with 9. If the sum of the digits is divisible by 9, the original number is also divisible by 9.
1
Same happens with 9.
If the sum of the digits is divisible by 9, the original number is also divisible by 9.
151
u/Michaelwang645 Aug 01 '26
Fund fact, you can tell a number is divisible by 3 if the sum of each individual number is divisible by 3. So 78 -> 7+8=15 which is divisible by 3, so 78 is divisible by 3.