The factors of 153 are:
1, 3, 9, 17, 51, 153
The factors of 270 are:
1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135, 270
The common factors are:
1, 3, 9
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The greatest common factor of 66 and 153 is 3.
Since 45 is a factor of 270, it is automatically the GCF.
17
It is: 2
It is just 1