I have seen that mastery comes from practice. Graphing and understanding graphs is a particular point of difficulty for many students. So, I created these cards to get students to concentrate on what the characteristics of a graph tell us ... without knowing what the equation of the graph is. I print one set on blue paper, one set on yellow paper, etc. Then, teams of 3 or 4 students can compete. Don't use all ten sets at one time; it can be a little tiring for them. I found that using half of them each time works best.