Florida B.E.S.T. MA.912.FL.4.2
The Standard
Compare the advantages and disadvantages for adding on a one-time warranty to a purchase using spreadsheets and other technology.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students compare the cost of buying optional product protection with paying for repairs or replacement themselves. They use spreadsheet formulas to test different failure rates and coverage limits.
What Mastery Looks Like
- Students enter accurate costs and formulas in a spreadsheet. They compare possible outcomes, find a break-even failure rate, and support a recommendation with numbers and coverage details.
Common Misconceptions
- Students may assume any product failure is covered, overlooking deductibles, time limits, and exclusions. They may also treat expected cost as a guaranteed outcome or ignore existing manufacturer coverage.
How to Assess It
- Give students an $800 laptop, a $120 warranty, a $500 repair cost, and a 15% failure chance. Ask for spreadsheet calculations and a two-sentence recommendation.
Lesson moves
Ways to Teach It
Give pairs product, warranty, and repair-cost cards, then have them build a spreadsheet comparing no-failure, repair, and replacement scenarios.
Ask, "When might paying more on average for a warranty still make sense?" Students respond using risk tolerance and coverage terms.
Run a Warranty or Skip game with six purchase scenarios, where teams calculate break-even failure rates and defend each choice.
Students examine a retailer warranty for a phone or laptop, recording price, term, deductible, exclusions, and likely repair cost.
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