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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.

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

Practice adding fractions that have different denominators.

www.khanacademy.org/math/arithmetic/fraction-arithmetic/arith-review-add-sub-fractions/v/adding-small-fractions-with-unlike-denominators

[Voiceover] Let's say that we have the fraction 9/10, and I want to add to that the fraction 1/6. What is this, what is this going to equal? So when you first look at ...

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

This prealgebra lesson explains how to add and subtract fractions when the denominators are different.

www.ask.com/youtube?q=Adding+Fractions+with+Unlike+Denominators&v=RIhwfqULbAE
May 2, 2012 ... Adding fractions with different denominators, step by step, examples. For more free math videos visit http://MathMeeting.com.

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

Fun math practice! Improve your skills with free problems in 'Add fractions with unlike denominators' and thousands of other practice lessons.

www.helpwithfractions.com/adding-fractions-different-denominators

Aug 15, 2017 ... Master this simple trick for adding fractions with different or unlike denominators.

www.wikihow.com/Add-Fractions-With-Unlike-Denominators

This can become even more complex when the fractions have different denominators, or bottom numbers. Still, adding fractions with unlike denominators is ...

www.varsitytutors.com/hotmath/hotmath_help/topics/adding-fractions-unlike-denominators

To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a ...

learnzillion.com/lesson_plans/6861-add-fractions-with-unlike-denominators-by-creating-area-models

In this lesson you will learn how to add fractions with unlike denominators by creating area models.