This 18-slide PowerPoint presentation introduces the concept of a unit rate. It assumes students have already learned about the concept of a ratio. The material is based on Common Core 6th grade math standard: CCSS.Math.Content.6.RP.A.2. The presentation begins with a problem trying to compare two ratios to determine the best gas mileage. A tape diagram model is used to transform the ratios into unit rates to see how much more helpful they are when making comparisons. Unit rates are calculated u