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Compound Interest. In this activity, students solve problems involving compound interest (compounded annually, quarterly and monthly) on each of their 15 strips of paper. When a student completes a problem, you can quickly scan the QR code that is on the strip to see if the answer is correct. (A standard answer key is also included.) If an answer is correct, the student can turn the strip into a link for his or her chain with a stapler or piece of tape. Chain activities have motivated some of my harder-to-motivate students because they allow students to see the amount of work they are doing. How many links can your students get?