3 is the greatest number which divides 9, 12 and 15.
Factors of 9: 1, 3 and 9.
Factors of 12: 1, 2, 3, 4, 6 and 12.
Factors of 15: 1, 3, 5 and 15.
So, G.C.F. is 3.
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You need at least two numbers to find a GCF.
The GCF is 3.
-- The common factors of 3, 15, and 9 are 1 and 3 . -- Their greatest common factor is 3 . -- When discussing numbers, there is no such thing as the 'most' common factor.
the LCM of (a) and (b) is (ab) divided by (gcf of a and b) In this case, (a)=9 (45) = (9x)/(1) 45 = 9x 5= x ◄
You need at least two numbers to find a GCF. If that's 9 and 15, the GCF is 3.