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.
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.
Oh, what a happy little question! The reciprocal of a fraction is when you flip it upside down. So, the reciprocal of 7 over 18 is 18 over 7. Just like painting a beautiful landscape, math can be a peaceful and joyful experience when we take our time to understand it.