Divide 30 by 1, 2, 3 and 5.
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10x - 30 10(x - 3) ------------
You need at least two numbers to find a GCF.There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
Divide by two and three until you get to five. (30,1)(15,2)(10,3)(6,5)
10
It can be. 30 is a factor of 60.