Add 2 Fractions using easy method

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Taught by YourMathGal
  • Currently 4.0/5 Stars.
6701 views | 1 rating
Part of video series
Meets NCTM Standards:
Lesson Summary:

This lesson provides an easy method for adding two fractions with different denominators. By using the diagonal method, where you multiply the diagonals and add them together, and the least common denominator, you can quickly and easily add two fractions. While this method works for all fractions, it's best to use it when the denominators do not have a common factor, and it cannot be used with mixed numbers. Additionally, the lesson touches upon reducing fractions and the importance of paying attention to the greatest common factor.

Lesson Description:

This is an easy way to add 2 fractions that have different denominators. It's best to use when the denominators do not have a common factor. It does not work with mixed numbers.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

Questions answered by this video:
  • What is a quick easy way to add or subtract fractions?
  • What is a really easy way to get common denominators for two fractions and adding them?
  • How do you add 3/8 + 1/5 using the easy method for adding fractions with unlike denominators?
  • How do you add 5/12 + 3/11 using the easy method for adding fractions with unlike denominators?
  • How do you subtract 8/9 - 3/7 using the easy method for subtracting fractions with unlike denominators?
  • How do you add 3/8 + 1/6 using the easy method?
  • When should you use the easy method to add fractions?
  • How do you add 5/12 + 7/18 using the easy method?
  • Staff Review

    • Currently 4.0/5 Stars.
    This method of adding / subtracting fractions with unlike denominators makes operations with fractions seem much quicker and easier. It requires more simplifying at the end, but it certainly makes getting a common denominator and adding the two fractions very quick and simple. In some cases, however, it makes the numbers so large that it makes the problem even more difficult!