Factors for 147: 1, 3, 7, 21, 49, 147
Factors for 294: 1, 2, 3, 6, 7, 14, 21, 42, 49, 98, 147, 294
Common Factors: 1, 3, 7, 21, 49, 147
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1 3 7 21 49 147.
The highest common factor of the numbers 294, 252 and 210 is 42.
The common factors are: 1, 23
The common factors are: 1, 2, 4
There cannot be a greatest common factor 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.