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Since the numerator and denominator of the fraction are co-prime, the proper fraction 53/72 is already expressed in simplest form.
11 over 12
Seven Eighths.
The simplest form for the fraction 72/98 is 36/49 (The GCF is 2)
Expressed as a vulgar fraction in its simplest form, 36/72 is equal to 1/2, or one half.