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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/pre-algebra/fractions-pre-alg/fractions-unlike-denom-pre-alg/v/adding-fractions-with-unlike-denominators

www.khanacademy.org/math/pre-algebra/fractions-pre-alg/fractions-unlike-denom-pre-alg/e/adding_fractions

Practice

www.coolmath.com/prealgebra/01-fractions/fractions-12-adding-subtracting-different-denominators-01

This prealgebra lesson explains how to

math.about.com/od/fractions/ss/denom.htm

Like many other topics in math , there is usually more than one method to get to the desired results. Adding fractions and finding common demoninators is merely another example of this. Multiplying denominators to find common denominators. More »

www.mathsisfun.com/fractions_addition.html

There are 3 Simple Steps to

www.ixl.com/math/grade-5/add-fractions-with-unlike-denominators

Fun

www.webmath.com/addfract.html

This page will show you how to

www.mathplayground.com/fractions_add.html

www.

www.mathplayground.com/howto_fractions_diffden.html

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