http://www.greenemath.com/
In this lesson, we will revisit the topic of ratios, rates, and proportions. We will then learn how to solve a proportion equation using cross multiplication. In other words, we will set up our equation by multiplying the denominator of fraction 1 by the numerator of fraction 2 and set this equal to the product of the denominator of fraction 2 and the numerator of fraction 1.
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