Week 8 · Five disciplines · One fair market
Prices hide behind jars, units, banners, and crooked scales. Make every comparison reproducible, repair measured harm, and write a market code families can verify.
Unit rates compare package sizes. Conversions align quantities. Reference prices reveal real discounts. Calibration separates small variation from systematic shortage. The final code makes correction and appeal visible.
20 minutes
Fractions · Rates and equivalent quantities
Use division and equivalent quantities to compare prices fairly across fractional and decimal package sizes.
Make
A unit-price ledger
Story handoff: The council can compare oil by one shared unit. Across the spice aisle, sellers are mixing grams and kilograms—and one sign appears to exploit the confusion.
25 minutes
Measurement · Unit conversion and precision
Convert metric units before comparing quantities and recognize claims that exploit mismatched units.
Make
A conversion audit
Story handoff: The mixed-unit claim is removed. Now the sale banners promise savings with fractions and percentages, but only one includes enough information to verify the bargain.
25 minutes
Economics · Discounts and reference prices
Calculate percentage and fractional discounts, then inspect the reference price and purchase conditions.
Make
A bargain verification card
Story handoff: The council adopts a verifiable sale-sign format. Yet correct signs cannot protect families if the market scales themselves deliver less than the quantity paid for.
25 minutes
Ethics · Calibration, sampling, and remedy
Use repeated calibration checks to identify systematic measurement bias and propose a proportional, evidence-based remedy.
Make
A scale audit and remedy
Story handoff: The biased scale is removed and affected purchases are reviewed. The market now needs one public code that makes quantity, price, discounts, calibration, and complaints verifiable for everyone.
25 minutes
Civic reasoning · Standards and accountability
Synthesize mathematical rules and ethical procedures into a transparent standard that different people can verify.
Make
A fair-measure code
Story handoff: The market reopens with shared measures and visible remedies. Families do not have to trust the loudest banner; they can reproduce the comparison themselves.
Attempts stay on this device. Finished work stays finished, and the family portfolio shows only evidence the learner actually completed here.
