Multiples of 84
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a number is divisible by 12 if the number is also divisible by both 3 and 7. You mean a number is divisible by 21 if it is divisible by 3 and 7.
12/21 = 4/7 NOTE : The original fraction can be simplified as both the denominator and numerator are divisible by 3. That is, 3 is a common factor of 12 and 21.
4, 8, 12, 16, and 20.
Because 21 is divisible by numbers other than 1 and 21. 21 is divisible by 1, 3, 7, 21
Absolutely - any number that is divisible by 12 - is also divisible by 6 !