Here are two full color worksheets for teaching simple interest I=prt. The worksheets are labeled "Homework" and "Class Activity" and each worksheet has three problems detailing an Interest = principal x rate x time problem. The worksheets are also labeled with the I=prt formula and the details of each variable. Worksheets can be easily printed in black and white. For more Hands On Math activities see my website http://handsonmath.blogspot.com/