When you divide fractions you need to multiply by the reciprocal of the divisor. You would also use it anytime the multiplicative inverse is required.
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No, the product of reciprocals is 1.
If you multiply two reciprocals, their product must be 1.
Every pair of mutual reciprocals has a product of 1 .
Reciprocals are important because they serve as a guideline on how much more you need to get one whole.
A teacher mainly uses math to teach it to the students. Other opinions could possibly say that everyone uses math in their life at home as in groceries ect.