To divide two fractions, multiply the first by the reciprocal of the second.
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To divide by a fraction, you multiply by its reciprocal. This is related to the facts that (1) division is the opposite of multiplication, and (2) a reciprocal is the multiplicative "opposite" of a number.
When you divide one number by another which is not a factor.
To divide one fraction by another fraction,flip the second one over and multiply them.
When dividing one fraction by another, invert the second fraction and multiply them.
One simple way is to flip the second fraction over (use its reciprocal) and multiply them.