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The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
Two common multiples of 21 and 15 are 105 and 315.
Multiples? There are an infinite amount. Factors on the other hand, there are: 1, 3, 7 and 21.
Because they are multiples of 5. All multiples of 5 have 5 as a factor, which means they are divisible by 5.