It is one = 1
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they are odd
21 = 7 x 3 , 9 = 3 x 3 ; for the Least Common Multiple (LCM), 21 already is a multiple of 7. 21 & 9 have a common factor of 3, so LCM = 21 x 3 = 63
The least common factor of any set of numbers is 1.
It is: 9 divided by 7/3 = 27/7 or 3 and 6/7 as a mixed number
They have no prime factors in common, as 9 = 3*3 and 7 is prime. Their GCF is 1. They are both positive integers you can count on your fingers.