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You have to use the rules of 4 and 9

Using the rules of 2 and 18 won't work because the smallest common multiple of 2 and 18 is 18 not 36. 3 and 12 won't work either because the smallest common multiple of 3 and 12 is 12 not 36. However 4 and 9 does work because their biggest common divisor is 1 so multiplying them works. The biggest common divisor of 2 and 18 is 2 and the biggest common divisor of 3 and 12 is 3

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The divisibility rules of 4 and 9 are combined to make the divisibility rule of 36.

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12y ago
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That's right. That's the only way that works because 4 and 9 are coprime to each other. 3 and 12 doesn't work because their biggest common divisor is 3 and their smallest common multiple is 12

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Q: What divisibility rules were combined to make the divisibility rule of 36?
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