To find the GCF of 18 and 10 you have to split them into their prime factors:
18 = 2x3x3
10 = 2x5
Next you have to identify any common prime factors. In this case both numbers have a 2 as a prime factor. Therefore, the GCF of 18 and 10 is 2.
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The GCF is 18.
The GCF is 2.
The GCF is 9.
You need at least two numbers to find a GCF. The GCF of 18 and 24 is 6.
gcf of 144 and 54 is 18.