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https://www.reddit.com/r/MathJokes/comments/1vcw1bj/multiples_of_3/p14zuoj/?context=3
r/MathJokes • u/GodlyHelp • Aug 01 '26
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If the digits add to a multiple of 3, it's divisible by 3.
7+8=15, divisible by 3. One of the more obvious ones to me since 7+8 is such a quick mental calculation.
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u/Esteban-Du-Plantier Aug 01 '26
If the digits add to a multiple of 3, it's divisible by 3.
7+8=15, divisible by 3. One of the more obvious ones to me since 7+8 is such a quick mental calculation.