There is no such thing as a common fraction. The nearest phrase is a common factor, but a single number cannot have a COMMON factor since there is nothing for the commonality.
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77 written as a fraction is 77/1
.77 as a fraction is 77/100
7.70 as a fraction = 77/107.7 * 10/10 = 77/10 in fraction
77/100
77 = 77/1