Are you looking for a way to motivate your students to practice a little more on their subtraction facts? I started having my students graph the amount of facts they can complete on our 5 minute timed tests this year and it has been quite motivating in my classroom! I remind my students that they are only trying to match or beat THEIR OWN score from the week before. The kids love coloring in the graph and comparing their score from week to week. At the beginning of our subtraction facts instruction they are only assessed on 40 facts, so the kids see growth as the amount of problems increases from week to week, which makes this graph usable no matter how many problems you are required to test on.
I also have an addition graph in my TPT store.