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Any number where the individual digits add up to a number divisible by ‘3’ is divisible by 3.

51 = 5+1 = 6, which is divisible by three.

Try it, you’ll see it always works.

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One of the reasons why I love the number 3. There are other neat digit sum tricks, see for example for the numbers 1 to 30 here: https://en.m.wikipedia.org/wiki/Divisibility_rule

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They didn’t teach stuff like this in school, which is silly. This is the kind of thing that a kid would eat up. It’s like they wanted to make sure people hated math.

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I guess I was one of the lucky few who learned this in elementary school. And later again.

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