45/21 = 15/7
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45/20 = 9/4 = 21/4
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 3, 21/45 is equal to 7/15 or seven fifteenths.
43/45 is in its simplest form.
17/45 is in its simplest form.
8/45 is in its simplest form