If the denominators are the same, subtract the numerators. If the denominators are different, convert them to equivalent fractions with a common denominator and subtract the numerators.
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It means you have to subtract fractions.
Before adding or subtracting two fractions they are converted into like fractions. Explain with examples why this is necessary.
Subtracting a fraction is the same as adding its negative.
They have to have the same denominator.
Ensure that the denominators are the same when adding or subtracting fractions.