How do you know when to add or subtract like terms?
we are reviewing in school
Follow the order of operations. If you google it, I'm sure you can find a study sheet you can print out or make some flashcards so you can remember. Usually, there are parenthesis to tell you which to do first.
First remove parentheses. If there is a - sign in front of the ( )'s carry it through. Then if there's a + sign in front of the term, add it. If there's a - sign, subtract it.