This one-day lesson is designed to introduce the idea of rate of change, connect it to real world applications, graph proportional relationships, and interpret the unit rate as the slope of the line that models the relationship. From calculating heart rate to trying to beat Purin, the dog’s world record, there are numerous hands-on activities to connect the idea of rate of change to real world applications throughout this lesson. I added slide notes for each card. Please feel free to contact me if you have questions. I would be happy to Skype with you prior to implementing this lesson with students or answer questions via instant messaging. My contact info is included on the last slide. The data sheet for the 3 examples in this lesson is available for download at: http://bit.ly/2qrjG1w I hope you and your students enjoy it as much as we did!