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Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding and Subtracting Fractions
This video shows how to add and subtract fractions with like and unlike denominators. Practice problems are available. [9:49]
Imagine Learning Classroom
Learn Zillion: Subtract Fractions With Unlike Denominators Using Fraction Bars
In this lesson, you will learn how to subtract fractions with unlike denominators by using fraction bars. [5:48]