# Alg 1 -- Adding & Subtracting Rational Expressions - Day 1

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I use this lesson to show my students how to add and subtract rational expressions that have common denominators. This corresponds to Section 11.4 of the Prentice Hall CA Algebra 1 textbook. I break this lesson into two days -- Day 1: I show them how to add and subtract with like denominators; Day 2: I show them how to add and subtract with unlike denominators. This is the PowerPoint lesson for Day 1.

There is a video in the lesson that describes how to work these problems, including the factoring of quadratic trinomials in order to simplify the answer. That makes this a great lesson for days when you have a substitute teacher, or for home teaching, or you can use that time to take roll while the lesson continues.

This is the third lesson in my unit on Rational Expressions:
Powerpoint Lessons for Unit 14
14.1 Simplifying Rational Expressions
14.2 Multiplying & Dividing Rational Expressions
14.3 Adding & Subtracting Rational Expressions – Day 1
14.4 Adding & Subtracting Rational Expressions – Day 2
14.5 Complex Fractions
14.6 Solving Rational Equations
14.7 Work Problems

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Fun Reviews
Operations with Rational Expressions Relay
Operations with Rational Expressions Scavenger Hunt
Solving Rational Equations Scavenger Hunt
Work Problems Scavenger Hunt
Simplifying Complex Fractions Scavenger Hunt
Solving Rational Equations (easy) Scavenger Hunt
Rational Expressions & Equations Jeopardy

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For fun ways to review other important topics, try these:
Scavenger Hunts
Fun PowerPoint Review Games
Relays
Tic Tac Toes
Partner Problems
Bingos

Common Core Standards
A-REI 2. Solve simple rational and radical equations in one variable, and give examples showing how extraneous solutions may arise.
A-APR 7. Understand that rational expressions form a system analogous to the rational numbers, closed under addition, subtraction, multiplication, and division by a nonzero rational expression; add, subtract, multiply, and divide rational expressions.

Previous California Standards for Algebra 1:
12.0 Students simplify fractions with polynomials in the numerator and denominator by factoring both and reducing them to the lowest terms.
13.0 Students add, subtract, multiply, and divide rational expressions and functions. Students solve both computationally and conceptually challenging problems by using these techniques.
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