Click on "Decimal to Percent" under Practice in the middle column. Click the Start button to begin game. Note that the title on the practice page is backwards--it says Percent to a Decimal, but this page actually has practice in converting Decimals to Percents.
With this calculator, you don't have to calculate the interest rate per period and number of periods. Just choose the correct compounding option, and enter the annual rate and number of years (along with the present value), and the calculator does all the work for you!