Well, darling, 54 over 90 simplifies to 3 over 5. You just divide the top and bottom by the greatest common factor, which in this case is 18. Voila, you've got yourself a simplified fraction. Math can be a breeze when you know the tricks!
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Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 18, 54/90 is equal to 3/5 or three fifths.