http://whyu.net/media/download/Pre-Algebra 15 - Least Common Denominators - small.mp4
In this tutorial, students will be exposed to the strategy of finding the least common denominator for certain cases. Sometimes when finding a common denominator, an unnecessarily large common denominator is created (a/b x c/d = ad + bc/bd). This chapter explains how to find the smallest possible common denominator. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12.
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