5,631,683,557,500,000 is a multiple of 3 because its digits add up to a multiple of 3. It's a multiple of 5 because it ends in a zero. If it's a multiple of 3 and 5, it's a multiple of 15, so 15 is a factor of it.
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15 is not a factor of 100.
Since 15 is a factor of 45, and 15's largest factor cannot be larger than itself, the greatest common factor of 15 and 45 is 15.
what is the smallest factor of 15
15 is both a multiple and a factor of itself.
Factor 5a-15 Factor out the 5; 5(a-3)