Preview · the opening missionRead this to the class:
The class has $40 to buy supplies and snacks for a field-trip day. At the store, Priya grabbed the biggest packages: "Big packs are always cheaper." Then she saw a sign: "25% OFF T-shirts!" and said, "That's the best sale in the store." Omar wasn't sure. Your team's job: work out which deals really save the most, so the class gets as much as possible for its $40.
Teams of three, with jobs that rotate after each card: Shopper (reads the card aloud), Calculator (works out the unit price or percent), Checker (checks the answer a second way and records it).
Look inside the PDF
Sample pages, stamped “preview”. The download is the clean, full lesson.
In the full lesson PDF
9 printable pages
- Predict (5–10 min)
- Hunt (20 min)
- Reveal (10–15 min)
- Act (10 min)
- Background for the teacher
- Assessment
- Student sheet
- Worksheet: Store cards
- Worksheet: Label it
- Worksheet: Try it at home
On the student sheet
- My prediction
- Our unit prices
- Percents
- What did we find?
- Our shopping plan
- Exit ticket
- Store cards
- Label it
- Try it at home
US Letter, prints cleanly in black and white. The student sheet is on its own page, ready to photocopy.
Free with an account (any 3 lessons), or US$19 for all 4 lessons in this unit.
What students show by the end
- Finds unit prices
- Uses percent
- Makes a reasoned choice
From the lesson’s rubric, which scores each one as not yet, getting there or got it.
Questions teachers ask
How long does “Which is the better deal?” take?
45–60 min. Group size: teams of 3.
How much prep does it need?
5 minutes: print one set of Store cards from the Worksheet per team and cut them apart. Calculators are useful but not needed. All prices are made up for the lesson.
What materials do I need?
Store cards (from the Worksheet).
Which curriculum standards does it cover?
Common Core Math (US): 6.RP.A.2, 6.RP.A.3 and 7.RP.A.3 (partly).
What’s in the lesson PDF?
A teacher guide that walks you through predict, hunt, reveal, act, background for the teacher and assessment, then a student sheet (“My prediction”, “Our unit prices”, “Percents”, “What did we find?”, “Our shopping plan”, “Exit ticket”, “Store cards”, “Label it” and “Try it at home”) on its own page, ready to photocopy. It’s US Letter and prints cleanly in black and white.
Can I try it for free?
Yes. A free account includes any 3 full lessons of your choice, and this can be one of them. After that, this unit is US$19 for all 4 lessons, yours to keep, or every lesson is US$199 a year.