6th Grade Math
Focus 2: Rates, including percent
Standards: 6.RP.2, 6.RP3b, 6.RP.3c
Resource: Fosnot- Best Buys, Ratios, and Rates
Addition and Subtraction of Fractions
Best Buy on Cat Food and The Price of Birdseed
DAY ONE: Part 1
Students 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
3
2
1
0



I understand ratio, rates, and proportions thoroughly.
I can confidently use what I have learned.
I can help others understand it.

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


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.

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.



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 2
Creating Clear and Concise Strategy & “Proof” Posters
to Prepare for the Math Congress