subtracting similar fractions is just like adding them. You only subtract the numerator (top part) and then copy the denominator (bottom part).
4/5 - 1/5 = 3/5
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Similar fractions are fractions with the same denominator. In order to add or subtract fractions they need to be similar.
If the denominators are the same (which is what I understand by "similar fractions"), just subtract the numerators (the upper part).
Change the whole number into an improper fraction with the same denominator as the fraction and then subtract accordingly
First you would want to change the mixed number to an improper fraction. Then you can subtract
If the fractions have the same denominator, just add or subtract the numerators. 13/20 - 9/20 = 4/20 2/5 + 1/5 = 3/5