The GCF is: 20
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The GCF is 4.
The greatest common factor of 156 , 40 = 4
Since 40 is a factor of 280, it is automatically the GCF.
Since 40 is a factor of 120, all the factors of 40 are common to 120. There can only be one greatest. 1, 2, 4, 5, 8, 10, 20, 40 The GCF is 40.
To find the greatest common factor, list the prime factors of each number:40: 2 x 2 x 2 x 520: 2 x 2 x 5Then select the factors that each share:2 x 2 x 5 (they each share these individual numbers)So, the greatest common factor is 20.Since 20 is a factor of 40, it is automatically the GCF.