A fraction is 28/56. You can multiply both the numerator (top) and the denominator (bottom) of the fraction by any non-zero integer or divide both by any common factor and you will have an equivalent fraction.
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The GCF is 28.
The GCF is 4.
The GCF of 16, 28 and 56 is 4.
The GCF is 28.
The GCF of 20, 28, and 56 is 4.