Adding rational expressions with different denominators 1
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Lesson Summary:
In this lesson, you will learn how to add and subtract rational expressions with different denominators by finding a common denominator. The first part of the lesson reviews adding fractions with the same denominator, and then dives into examples with varying denominators. The teacher demonstrates how to use the "jealousy method" to find the least common denominator, and also provides an alternative method for finding it quickly. By the end of the lesson, you will be able to add and subtract rational expressions with confidence, even when the denominators are not the same.
Lesson Description:
Shows how to add and subtract algebraic fractions by getting a common denominator.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
Questions answered by this video:
- How do you add and subtract rational expressions with different denominators?
- How do you add 5/6x + 7/9x^2 by finding common denominators?
- What is the jealousy method for finding the LCD and how is it used to add fractions?
- How can you subtract (3x - 4)/6x - (2x - 5)/4x by finding common denominators?
- How do you subtract 2/9m - 5/12m^2 by finding the LCD?
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Staff Review
This lesson starts off with a review of how to add and subtract rational expressions that have the same denominator and goes on to explain how to add and subtract these algebraic fractions that have different denominators. This uses the newly-learned skill of finding LCDs for rational expressions. This is a great tutorial for learning to add and subtract without common denominators.
