the denominator
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The upper part of a fraction is its numerator and the lower part of a fraction is its denominator.
It is the denominator which is the lower part of the fraction
the numerator is the top number and the denominator is the lower number. If they get switched it can change the entire value of the fraction.
To rename a mixed number to a fraction, you multiply the number outside the fraction by the denominator (the lower part of the fraction), and then you add that number to the numerator (higher number of the fraction). If you need to turn 2 3/4 into a fraction, you do this: 2*4=8, 8+3=11, so 2 3/4=11/4 as an improper fraction.
by dividing by a common number for the numerator and denomenator (the answer is 1/2)