So maybe parentheses don't seem like a big deal? Check out this problem and the difference in the answer when you work it without the parentheses. Wow.
Evaluating expressions with parentheses is a free educational video by Khan Academy.It helps students in grades 5 practice the following standards 5.OA.A.1.
1. 5.OA.A.1 : Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols..
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