## Buyer Beware: Rates, Ratios, Percents, and Proportions

Students first study rates through unit pricing and use graphs and calculators to find the best buy. Students then learn about different ways to think about and solve problems with ratios and proportions. Finally, students explore percents and pie charts by organizing information for sports teams and planning a sports banquet. Throughout the unit, students are in the role of consumer reporters, reporting on fictitious claims made about different products.

### NCTM Standard: Number and Operations

• Understand numbers, ways of representing numbers, relationships among numbers, and number systems
• Understand meanings of operations and how they relate to one another
• Compute fluently and make reasonable estimates

### Primary Mathematical Goals

• Calculate with percents
• Translate between fractions, decimals, and percents
• Calculate and compare cost per unit
• Compare ratios
• Set up and solve problems using percents and ratios
• Use circle graphs and line graphs to represent data