I always start my class with an easily accessible warm up (do now, drill, whatever you want to call it) so all students feel confident beginning math class. The skill is either something that is pre-requisite to that day's lesson or review from previous days. I do a couple examples on the board, and give students 5-7 minutes to complete a short drill which we then grade right away. This particular vocabulary drill helps students practice identifying the degree, leading coefficient, domain, range