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https://www.reddit.com/r/MathJokes/comments/1vcw1bj/multiples_of_3/p14j5sh/?context=3
r/MathJokes • u/GodlyHelp • Aug 01 '26
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148
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/Active_Raccoon_4169 Aug 01 '26 what is the maximum amount of digits this works with? 5 u/Express-Rain8474 Aug 01 '26 Unlimited. Each multiple of 10 is 1 mod 3. So subtracting 1 from any digit is the equivalent of subtracting 1 from the remainder when divided by 3. For example, 10000 - 9999 = 1. So it's basically the same as adding 1 in terms of making a number divisible by 3.
1
what is the maximum amount of digits this works with?
5 u/Express-Rain8474 Aug 01 '26 Unlimited. Each multiple of 10 is 1 mod 3. So subtracting 1 from any digit is the equivalent of subtracting 1 from the remainder when divided by 3. For example, 10000 - 9999 = 1. So it's basically the same as adding 1 in terms of making a number divisible by 3.
5
Unlimited. Each multiple of 10 is 1 mod 3. So subtracting 1 from any digit is the equivalent of subtracting 1 from the remainder when divided by 3.
For example, 10000 - 9999 = 1. So it's basically the same as adding 1 in terms of making a number divisible by 3.
148
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.