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Imagine Learning Classroom
Learn Zillion: Work With Expressions That Have Parentheses
In this lesson, you will learn how to evaluate an expression by interpreting parentheses as "do this first." [4:55]
Khan Academy
Khan Academy: Evaluating Expressions With and Without Parentheses
Demonstrates the role of parentheses in a written expression by solving one with and without the parentheses. [2:06]