When answering a question such as "Name two numbers whose GCF is 6" there are two quick and easy ways to do this. One is to name 6 and any multiple of 6. The other is to name any multiples of 6 that differ by 6.
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You can find the GCF of two numbers by dividing their product by their LCM. The LCM of 30 and 42 is 210. What is their GCF? 30 x 42 = 1260 divided by 210 = 6 The GCF of 30 and 42 is 6.
You need at least two numbers to find a GCF. If that's 72 and 96, the GCF is 24.
You need at least two numbers to find a GCF.
You need at least two numbers to find a GCF. If that's 16 and 66, the GCF is 2.
You need at least two numbers to find a GCF.