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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-and-subtracting-fractions

Discussion and questions for this video. Welcome to the presentation on

www.math.com/school/subject1/lessons/S1U4L3GL.html

Like

www.themathpage.com/arith/add-fractions-subtract-fractions-1.htm

A

math.about.com/od/fractions/Fraction_Help_and_Tutorials.htm

All about fractions . Learn how to add, subtract , multiply and divide fractions . Change fractions from and improper one to a mixed number. More »

www.coolmath4kids.com/fractions/fractions-12-adding-subtracting-different-denominators-01.html

Zeebo King of the Fractions. Fractions: <12>

www.ixl.com/math/grade-7/add-and-subtract-fractions

Fun math practice! Improve your skills with free problems in '

learnzillion.com/lesson_plans/8178-add-and-subtract-fractions-with-unlike-denominators

www.brainpop.com/math/numbersandoperations/addingandsubtractingfractions/

In this educational animated movie about Math learn more about how to

www.purplemath.com/modules/fraction4.htm

Sections: Reducing fractions, Mixed numbers and improper fractions, Multiplying
and dividing fractions,

Popular Q&A

Q:
Ideas for Adding & Subtracting Fractions .

A:
Fractions can not be added or subtracted unless there are similar denominators. The easy way to make the denominators the same is to multiply the numerators and...
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Adding & subtraction fractions help?

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So.say you have 3/12 +3/12=6/12.which you can reduce to one half.if they have different denominators like. 3/4 +6/8 the just change them to one single denominat...
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2) LCD of x and x+5 is x(x+5) = x^2 +5x 5) LCD of 7y/12 and 3y/90 is 180 so 7y/12 = 105y/180, and 3y/90= 6y/180 6) LCD of 5/4x^2 and 7/xy^2 is 4x^2y^2 so 5/4x^2...
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Adding subtracting fractions help?

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Find a common denominator; then it's easy. One way to find a common denominator is to multiply the denominators together, but you may be able to recognize them ...
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How to adding and subtracting fractions ?

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