I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.
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Subtracting a fraction is the same as adding its negative.
Ensure that the denominators are the same when adding or subtracting fractions.
When adding or subtracting fractions their denominators must be the same
Before adding or subtracting two fractions they are converted into like fractions. Explain with examples why this is necessary.
They have to have the same denominator.