6th Grade MathFocus 2: Rates, including percentStandards: 6.RP.2, 6.RP3b, 6.RP.3c

Resource: Fosnot- Best Buys, Ratios, and RatesAddition and Subtraction of Fractions

Best Buy on Cat Food and The Price of Birdseed

DAY ONE: Part 1Students investigate, develop strategies, draft “proofs,” and create a poster clearly displaying their understanding

Today’s Learning Target

Students will be able to understand proportional reasoning, fractions, and equivalence by determining the unit prices or comparing the costs of buying more cans/items in a group.

Today’s Learning Target Scale

4 I understand ratio, rates, and proportions thoroughly. I can confidently use what I have learned. I can help others understand it.

3 I am able to understand proportional reasoning, fractions, and

equivalence by determining the unit prices or comparing the costs of buying more cans/items in a group 

2 I have a basic understanding of ratios, rates, and proportions. I’ve identified a few questions that I’ll need to have answered before I use

what I have learned.

1 I have some understanding of some parts of ratios, rates, and proportions. I have many questions that I’ll need to have answered before I can use

what I have learned.

0 I do not understand ratios, rates, and proportions. I do not know where to begin.

Bob’s Best Buys

Maria’s Pet Emporium

These are pictures of two pet stores. As you can see, both stores are having a sale on cat food.

Bob’s ad reads, “This week only: 12 cans of KittenGourmet for $15.” Maria’s ad read, “Super Sale: 20 cans of KittenGourmet for $23.”

Both stores are offering the same brand of cat food but are pricing it differently! Advertising is often confusing, isn’t it? Each store wants you to think that it has the best sale price.

1. Which store has the better price?

2. How do you know?

Working with your partner, investigate the problem and develop a strategy to solve the questions below.

1.Which store has the better sale price on KittenGourmet?

2.How do you know?Explain your “proof” in your math workbook (3-5 sentences)

and be prepared to share your proof with another pair of students.

DAY ONE: Part 2Creating Clear and Concise Strategy & “Proof” Posters to Prepare for the Math Congress