Calculating Interest

Instructions: Use a calculator in every mode. In Foundation, fill in the missing interest, principal, or annual rate. The interest shown always covers 3, 6, or 9 months. Core and Challenge use word problems, including finding time and total repayments. For shorter periods, relate the interest to the annual rate. Get 3 correct answers to unlock the next level. Challenge sometimes includes a savings account where one year of interest has already been credited.