Rule 15: To divide a fraction by a whole number, or a whole number by a fraction, convert the division process to a multiplication process, and complete the following steps.
Change the division sign to multiplication and invert the fraction to the right of the sign.
Multiply the numerators and the denominators, but leave them
in factored form.
Factor the numerator and the denominator and look for the fraction whose value is 1.
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Author: Nancy Marcus