If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Writing expressions

2 videos
3 skills
In this tutorial, we will learn to describe situations using mathematical expressions, and consider the effect of using parentheses in the outcome of those expressions.

Constructing numerical expressions

VIDEO 1:22 minutes
This word problem can be solved by constructing a numerical expression. Can you help? We bet you can!

Evaluating expressions with and without parentheses

VIDEO 2:06 minutes
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.

Translating expressions with parentheses

Practice translating expressions from verbal forms to "mathy" forms.

Creating expressions with parentheses

Practice creating expressions with parentheses from real-world contexts.