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.
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They have 63 in common because
63 divided by 9 = 7 and
63 divided by 7 =9 and
7 times 9 = 63 and
9 times 7 = 63
The Least Common Multiple (LCM) for 7 9 is 63.
The least common multiple of 7 , 9 , 21 = 63
504 is the least common multiple of 7, 8 and 9. All numbers that are multiples of 504 are multiples of 7, 8 and 9 as well
None. 7 and 9 haveno common factors other than 1.Factors of 7: 1, 7Factors of 9: 1, 3, 9
The least common multiple of 7 , 8 , 9 = 504