A Common Denominator
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When adding or subtracting fractions their denominators must be the same
I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.
you must make the fractions equivalent and with the same denomenator
Subtracting a fraction is the same as adding its negative.
Ensure that the denominators are the same when adding or subtracting fractions.