21/54 = 7/18
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Three is the lowest common denominator. 21 divided by 3 = 7 54 divided by 3 = 18 21/54 = 7/18
54/126 simplest form
54/245 is in its simplest form.
18/54 = 1/3 in its simplest form
2/3 is the simplest form of 54/81.