The factors of 15 are: 1, 3, 5, 15
The factors of 45 are: 1, 3, 5, 9, 15, 45
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1, 3, 5, 9, 15, 45
The greatest common factor of 15, 45 and 100 is 5.
The greatest common factor of the numbers 45, 75 and 90 is 15.
It is because the factors of 45 are 1, 3, 5, 15, 45
The GCF is 45.