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Smart Shopper Challenge

A practical consumer math lesson focusing on real-world financial literacy. Students calculate unit prices, evaluate percentage discounts and coupons, and determine final checkout costs including sales tax.

CDCheri Donahoe

Smart Shopper Challenge

A practical consumer math lesson focusing on real-world financial literacy. Students calculate unit prices, evaluate percentage discounts and coupons, and determine final checkout costs including sales tax.

CDCheri Donahoe

Page 1 of 1

$50.00 − Total: $ ________

Smart Shopper Rule: BOGO 50% on identical items gives the exact same 25% total discount!

Page 1 of 1

Helmet ($50 @ 15%):
$7.50
$42.50

• Bottle ($32 @ 25%): Savings = $8.00 | Sale = $24.00

3. Promo Code Showdown ($90 Cart)

• SAVE20 ($20 Off): Final = $90 − $20 = $70.00

• SPORT25 (25% Off): Discount = $22.50 | Final = $67.50

→ Winner: SPORT25 saves $2.50 more.

4. Register & Change

• Subtotal = $24.00 + $8.00 + $8.00 = $40.00

• Sales Tax (7%): $40.00 × 0.07 = $2.80

• Total Due: $40.00 + $2.80 = $42.80

• Change ($50.00 bill): $50.00 − $42.80 = $7.20

Standards Alignment: CCSS.MATH.CONTENT.6.RP.A.3.B (Unit rates), 7.RP.A.3 (Discounts, Tax, Percent markdowns).

Page 1 of 2

Educator Resource Scoring & Remediation

Series C Solutions & Teacher Grading Rubric

Worksheet 3 & Rubric

Series C: Market Master Solutions (Worksheet 3)

25 Points Total

1. Unit Price Face-Off

• Snacks: Box A = $6.75 ÷ 15 = $0.45/pack | Box B = $9.60 ÷ 24 = $0.40/pack

→ Better Buy: Box B (saves $0.05/pack)

• Water: 8-pk = $5.28 ÷ 96 = $0.055/oz | 12-pk = $7.20 ÷ 144 = $0.05/oz

→ Better Buy: 12-Pack (saves $0.005/oz)

2. Discount Dash

• Earphones ($90 @ 30%): Savings = $27.00 | Sale = $63.00

• Mousepad ($25 @ 20%): Savings = $5.00 | Sale = $20.00

• Speaker ($70 @ 40%): Savings = $28.00 | Sale = $42.00

3. Deal Duel (Two $40 Games = $80)

• Deal A (BOGO 50%): $40 + $20 = $60.00 (Saved $20)

• Deal B (25% Off Total): $80 − $20 = $60.00 (Saved $20)

→ Discovery: Both equal ($60.00); BOGO 50% = 25% total discount!

4. Register & Change

• Subtotal = $22.00 + $13.00 + $5.00 = $40.00

• Sales Tax (8%): $40.00 × 0.08 = $3.20

• Total Due: $40.00 + $3.20 = $43.20

• Change ($50.00 bill): $50.00 − $43.20 = $6.80

Scoring Breakdown (Per Worksheet • 25 Points Scale)

Part 1: Unit Price 6 Points 2 pts/item + 1 pt choice

Part 2: Discounts 6 Points 1 pt savings + 1 pt sale

Part 3: Coupons 6 Points 2 pts work + 2 pts diff

Part 4: Checkout 7 Points 2 pts tax + 2 total + 3 chg

Common Misconceptions & Remediation Tips

Inverted Unit Rates

Students often divide ounces by dollars ($18 ÷ 4.50) instead of dollars by ounces. Remind them: "Dollars always go in the doghouse (numerator)!"

Subtracting Percentages

Students sometimes subtract 20 from $45 directly ($25) instead of multiplying ($45 × 0.20 = $9). Reiterate that % must be converted to a decimal factor first.

Tax Addition vs. Subtraction

Students may mistakenly subtract sales tax like a coupon. Highlight that tax is an added cost to society/government, while discounts subtract.

Complete Classroom Suite • Master Teacher Reference

Page 2 of 2

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