National Council of Teachers of Mathematics
The Math Forum: Interest Rates
This Dr. Math site asks about simple interest and its effect on the repayment of a loan.
Council for Economic Education
Econ Ed Link: What's My Interest?
Students explore the concept of interest by means of two activities. The first, a simple activity with jellybeans, introduces the concept of interest accruement, and the second, a practical, "real world" activity, reinforces the concept...