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.
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1 is their highest common factor.
The highest common factor for 24 and 60 is 12.You can check your answer by: 12 * 5 = 60 12 * 2 = 24
24 and 60's highest common factor is 12.
30
The common factors of 12 and 60 are 1, 2, 3, 4, 6, 12.The highest common factor is 12.