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Price Patrol

A gallery walk math lesson where students analyze realistic retail advertisements to calculate unit prices, evaluate deceptive marketing tactics, and determine genuine value.

MQMelanie Quick

Price Patrol

A gallery walk math lesson where students analyze realistic retail advertisements to calculate unit prices, evaluate deceptive marketing tactics, and determine genuine value.

MQMelanie Quick

Stations 4, 5, 6

4

Station 4: Fiesta Nacho Chips

Target Unit: Cost per Ounce ($/oz)

OptionPriceNet WeightCalculation Space (Cost ÷ Ounces)Unit PriceBest Buy?
A: Standard$2.408 oz$/oz
B: Party Bag$5.7618 oz$/oz
C: BOGO 50%$5.4020 oz (2x10)$/oz

Ad Detective Trick Alert:

5

Station 5: PowerClean Detergent

Warning: Calculate Cost per Wash Load ($/load)

OptionPriceLoads CountCalculation Space (Cost ÷ Wash Loads)Unit PriceBest Buy?
A: Liquid Jug$9.6040 loads (64 oz)$/load
B: Pods Tub$12.6042 loads (42 pods)$/load
C: Compact$10.0050 loads (32 oz)$/load

Ad Detective Trick Alert:

6

Station 6: HydroFuel Sports Drink

Target Unit: Cost per Fluid Ounce ($/fl oz)

OptionPriceTotal Fl OzCalculation Space (Cost ÷ Fl Oz)Unit PriceBest Buy?
A: Single$1.6020 fl oz$/fl oz
B: 6-Pack$5.0472 fl oz (6x12)$/fl oz
C: Club Case$17.28192 fl oz (12x16)$/fl oz

Ad Detective Trick Alert:

Consumer Defense Debrief: Spotting Retail Psychology

1. Myth Buster: Why is buying in "bulk" or choosing the "largest size" not always the cheapest option? Give one example from today's walk:

2. Smart Shopper Rule: When comparing products like laundry detergent or multipacks, what must you double-check before deciding which is the better buy?

Option A (Standard 8 oz)

$2.40 ÷ 8 oz = $0.30 / oz

Option B (Party 18 oz)

$5.76 ÷ 18 oz = $0.32 / oz

Option C (BOGO 50% / 20 oz)

($3.60+$1.80) ÷ 20 oz = $0.27 / oz

Marketing Trick Debrief: The "Party Size" bag is mostly air-filled volume (slack fill) and costs 2 cents MORE per ounce ($0.32) than the standard snack bag ($0.30). The calculated BOGO offer yields the true discount ($0.27/oz).

5

Station 5: PowerClean Detergent

Best Buy: Option C ($0.20/load)

Option A (Liquid 40 loads)

$9.60 ÷ 40 loads = $0.24 / load

Option B (Pods 42 loads)

$12.60 ÷ 42 pods = $0.30 / load

Option C (Compact 50 loads)

$10.00 ÷ 50 loads = $0.20 / load

Unit Trap Debrief: If students divide by fluid ounces, Option C looks awful ($10/32 = $0.3125/oz vs Option A at $0.15/oz). But detergent is diluted with water; what matters is wash loads. Option C provides 50 loads at $0.20/load!

6

Station 6: HydroFuel Sports Drink

Best Buy: Option B ($0.07/fl oz)

Option A (Single 20 fl oz)

$1.60 ÷ 20 oz = $0.08 / fl oz

Option B (6-Pack 72 fl oz)

$5.04 ÷ 72 oz = $0.07 / fl oz

Option C (Club 192 fl oz)

$17.28 ÷ 192 oz = $0.09 / fl oz

Marketing Trick Debrief: Wholesale club psychological bias: consumers assume buying large pallet boxes automatically guarantees wholesale rates. Option C is the highest unit price ($0.09/oz) of all three!

Sample Criteria for Reflection & Whole-Class Debrief

Debrief Q1 (Bulk Myth): Students should cite examples like Cereal (Option B at $0.30 vs Option A at $0.28) or Sports Drinks (Club Pack at $0.09 vs 6-Pack at $0.07) showing that stores often mark up bulk packs knowing busy parents won't check unit rates.

Debrief Q2 (Standardized Units): Students must state that comparing products requires matching the true unit of usage (e.g. loads of laundry instead of ounces of water, cost per pen instead of cost per box).

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