Factors of 189: 1, 3, 7, 9, 21, 27, 63, 189 Factors of 2470: 1, 2, 5, 10, 13, 19, 26, 38, 65, 95, 130, 190, 247, 494, 1235, 2470 GCF (189, 2470) = 1
Factor them. 3 x 3 x 3 x 7 = 189 2 x 5 x 13 x 19 = 2470 No common prime factors. The GCF is 1.
You need at least two numbers to find a GCF.
The GCF is 27.
The GCF is 63.
The GCF is 9.
The GCF is 27.
The GCF is 1.
The GCF of 27 and 189 is 27.
The GCF is 27.
GCF(105, 145, 189) = 1: the three are coprime.
225=3^2x5^2 189=3x7x9 Therefore GCF(225, 189) = 3