This activity allows students to learn the difference between credit and debit cards. It is designed to be done in small groups between 3-5 students. Teams learn how to calculate interest, and how companies like Best Buy use interest to make money off of credit purchases. Students gain an understanding of interest, and the real cost of products purchased on credit. The second activity has students compare credit cards. I use real card offers that have been sent to me in the mail for the students to work with. I have found they struggle with real source material because they must read to see what information is important and what is not, I have not included the credit card offers, but will gladly email the ones I use to you if you want them. (I like using the actual offer instead of a copy) The final activity is for each team to pretend it is a "family" calculating the real cost of a Disney world vacation using each credit scenario. The "family" then decides whose card to use. These activities promote team work, discussion about mathematics, real world understanding of mathematics, and reading. This activity is in line with the Common Core Standards for grade 8 and the NCTM standards for middle school math.