There cannot be a common factor (GCF) of just one number. To be common there need to be at least two numbers.
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The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70 The common factors of 21 and 70 are 1 and 7.
Factors of 70 are 1, 2, 5, 7, 10, 14, 35, and 70.
The common factors are: 1, 2, 7, 14
The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70 The factors of 95 are: 1, 5, 19, 95 The common factors are: 1, 5 The Greatest Common Factor: GCF = 5
1 and 2