There's no such thing as a "common" divisor of a singlenumber.
The word "common" means "same for both".
There's nothing "common" until you have at least twonumbers.
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The factors of 119 are:
1, 7, 17, 119
The factors of 136 are:
1, 2, 4, 8, 17, 34, 68, 136
The common factors are:
1, 17
The Greatest Common Factor (GCF) is: 17
There is no greatest common factor of 136. You need to have two or more numbers to find a greatest common factor.