2 : The number ends with a 2, 4, 6, 8, or zero. (The number is 'even'.)
3 : The sum of the digits in the number is divisible by 3 .
5 : The number ends with a zero or a 5 .
6 : The number passes the tests above for both 2 and 3 .
10 : The number ends with a zero.
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If the rules for 2 and 3 work, the number is divisibale by 5.
Yes, you can tell using the divisibility rules. The answers are yes for all but 5 and 10.
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
It is divisible by 3 and 9 but not the others.