Edward C. answered 03/09/15
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Caltech Grad for math tutoring: Algebra through Calculus
A unit fraction is a fraction of the form 1/n where n is a positive integer. So to write these fractions as multiples of a unit fraction, just pull out the numerator as the multiplier.
2/4 = 2 * (1/4)
4/6 = 4 * (1/6)
3/4 = 3 * (1/4)