The systematic way to get the answer is: 90 = 2*3*3*5 210 = 2*3*5*7 So gcf is 2*3*5 = 30
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It is: 30
The Greatest Common Factor is 6
The greatest common factor of 1925 , 90 = 5
The greatest common factor of 24 , 90 = 6
The greatest common factor of 54 , 90 = 18