Description
This lesson reviews addition and subtraction of fractions using the familiar number line technique that students have seen in earlier grades. This leads to an algebraic explanation of how to add and subtract fractions and an opportunity to practice MP.7. The lesson then moves to the process for adding and subtracting rational expressions by converting to equivalent rational expressions with a common denominator. As in the past three lessons, parallels are drawn between arithmetic of rational numbers and arithmetic of rational expressions.
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From EngageNY.org of the New York State Education Department. Algebra II Module 1, Topic C, Lesson 25.
Available from engageny.org/resource/algebra-ii-module-1-topic-c-lesson-25; accessed 2015-05-29.
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