Adding and Subtracting Fractions / Mixed Numbers: Example 3. In this video, the instructor shows how to add / subtract fractions that have different denominators at the beginning. (04:02)

In this video they are teaching the lowest common denominator. They start with a fraction problem with all different denominators, so they need to find the lowest common denominator. Some examples are done. Video is good quality and good for all stud...ents as review or initial learning of the concept. (09:56)[more]

You can find the least common multiple (lowest common multiple) simply and quickly by using the upside down birthday cake method that this video shows. (02:33)

This video demonstrates how to find the least common denominator when adding and subtracting fractions. It also shows how to reduce fractions to their simplest form. The video is in lecture format with examples provided on the white board. (02:41)

In this 5-minute video, Salman Khan shows the viewer how to find the least common denominator with the fractions 2/8 and 5/6. Mr. Khan, of Khan Academy, uses computer software for demonstration. (04:49)

This selection teaches three ways to find a common denominator: see if the smaller denominator goes into the larger one, multiply the two denominators, or find the least common multiple. An example of each method is worked on an interactive white bo...ard. (03:07)[more]

Adding and Subtracting Fractions / Mixed Numbers: Example 2. In this video, I discuss how I go about finding a common denominator by looking at it in a 'brute force' method! (04:09)

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