Because multiplication and division are inverses of each other. We do the same thing with whole numbers, we just don't notice it.
12 divided by 2 equals 12 divided by 2/1 = 12 x 1/2
3/4 x 5/2 is easier to calculate than 3/4 divided by 2/5
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When you divide by fractions, you invert and multiply.
When dividing one fraction by another, invert the second fraction and multiply them.
You may be referring to the rule for dividing fractions. To divide one fraction by another, you invert the second fraction (exchange numerator and denominator), and multiply instead.
multiply
The process of dividing two fractions is to invert the second one and multiply. 3/4 divided by 5/6 = 3/4 x 6/5