What are skills that 7th/8th grade math students should practice?

Question

I'm going into my second year of teaching, we're required to have centers and I'm trying to figure out what skills i should include. it shouldn't be anything new, as students should be able to complete it on their own. so far I have math vocabulary and adding/sub./mulltiplying positive and negative integers.

Answer 1

1. Pre-algebra

2. Geometry

3. Pi, as in 3.145592....