putting the top number on bottom and bottom number on top
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you do that if you need to divide fractions, its called using the recipical.
The reciprocal of a fraction is obtained by flipping the numerator and denominator. Therefore, the reciprocal of ( \frac{7}{12} ) is ( \frac{12}{7} ).
You take the reciprocal of a fraction when you want to invert the numerator and the denominator. The reciprocal of a fraction is found by flipping the fraction upside down. For example, the reciprocal of 2/3 is 3/2.
Reflection
When you turn a fraction over you get a reciprocal.