Unit 3, Lesson 7
More Rate Comparisons
Grade 6
Preparation
Lesson Narrative
In this lesson, students gain fluency in working with unit rates by solving problems without scaffolding. They choose which unit rate to use to solve a problem, divide to find the desired unit rate, and multiply or divide by the unit rate to answer questions. Students may choose to create diagrams to represent the situations but are not prompted to do so.
In the main activity about shopping deals, students are given two rates—an original rate and a new rate—and are to decide whether to accept the latter. In the optional activity, students compare distances given in different units of length to determine which animal ran the farthest. To make comparisons, students need to use multiple conversion rates in a sequence to convert all the measurements to the same unit. This activity offers an additional opportunity to practice using unit rates in converting measurement units.
- Apply reasoning about ratios and unit rates to compare prices and justify (orally) whether a given price is a good deal.
Let's use unit rates like a pro.
Required Materials
Activity 3
Required Preparation
Consider providing access to calculators. All of the calculations in this lesson can be done using strategies learned in grade 5. If arithmetic practice is desired, don't offer calculators. If calculations are likely to present a significant barrier to grade-level work, make calculators available.
If desired, purchase a 4-pack beverage to display when launching the Warm-up.