because fact families are like this 2+2=4,4-2=2 and adding
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Subtracting a fraction is the same as adding its negative.
When adding or subtracting fractions their denominators must be the same
Ensure that the denominators are the same when adding or subtracting fractions.
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.