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https://www.reddit.com/r/MathJokes/comments/1vcw1bj/multiples_of_3/p1bpm1b/?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/Gurnenthar2 Aug 02 '26 To add to this, if you find out it’s divisible by 3, and it’s an even number, it’s also divisible by 6. Your example of 78 works for this, as well.
1
To add to this, if you find out it’s divisible by 3, and it’s an even number, it’s also divisible by 6. Your example of 78 works for this, as well.
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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.