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To add or subtract fractions, they must have the same denominator. If they do not, make the least common multiple of all of the denominators the new denominator. After adding or subtracting, reduce your answer.

When giving the fractions like denominators, whatever number you multiply the old denominator of a fraction by, you must also multiply it by the numerator.

Sources:

See Also:
Least Common Denominators

www.khanacademy.org/math/arithmetic/fraction-arithmetic/arith-review-add-sub-fractions/e/subtracting_fractions

Practice

www.khanacademy.org/math/in-seventh-grade-math/rational-numbers/copy-of-addition-subtraction-fractions/v/subtracting-fractions-with-unlike-denominators

If you conquered adding fractions with different denominators, then

www.mathsisfun.com/fractions_subtraction.html

There are 3 simple steps to

www.calculatorsoup.com/calculators/math/fractions.php

www.webmath.com/subfract.html

This page will show you how to

www.mathworksheets4kids.com/fraction-subtraction.php

www.mathplayground.com/fractions_sub.html

Practice

www.math-aids.com/Fractions/Subtracting_Fractions.html

This fraction worksheet is great for testing children and providing more practice in

www.ask.com/youtube?q=Subtracting Fractions&v=1xsKnSoTAJA

Feb 12, 2014 ... Subtracting Fractions with different denominators can be done mentally both
accurately and rapidly using this cool math trick. The way to minus ...