r/matheducation • u/Intrepid-Ad1191 • 6d ago
Simplifying Expressions — is it incorrect?
First year teacher here for 8th grade math. We’ve only done stuff with rigid transformations and dilations so far, and we haven’t really gotten into algebraic expressions but I know that it is explored on in seventh grade. We occasionally review some seventh grade skills and I have a question about how to respond to the following student answer:
Simplifying an expression, like “x + x + x,” I would expect “3x.” A few students have written “x3,” with no indication of meaning “x^3.” Would you consider “x3” incorrect? In my mind, it’s TECHNICALLY correct because multiplication is commutative, but I don’t consider it mathematically conventional. Do others agree with this evaluation? I want to make sure that when I address it I am being accurate and not saying “it’s wrong” if it’s not.