Find the greatest common factor of 30 and 45 by short division
So the greatest common factor of 30 and 45 is 3 × 5 = 15
Greatest common factor of 18 and 30 and 45
The greatest common factor is 3
The greatest common factor of 30 and 45, 15 and 40
The greatest common factor of 30 and 45, 15 and 40
30 and 45 greatest common factor 15
The greatest common factor of 15 and 40 is 5
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