Evaluating expressions with & without parentheses (Full video)

Khan Academy

Supporting grades: 5

Description: 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. What I want to do is think about whether this expression right over here would evaluate the same way whether or not we had parentheses. So to think about that, let's first think about how it would evaluate if we add the parentheses. And now we want to do the multiplication before we do subtraction.

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