Florida B.E.S.T. MA.912.FL.2.3
The Standard
Explain how consumer price index (CPI), gross domestic product (GDP), stock indices, unemployment rate and trade deficit are calculated. Interpret their value in terms of the context.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students calculate CPI from market basket costs, GDP from spending components, and a stock index using its stated weighting rule. They find unemployment using the labor force and determine when imports create a trade deficit. They explain what each result shows in context.
What Mastery Looks Like
- Given a small data set, a student selects the correct base period, denominator, weights, and included values. The student calculates all five measures accurately. Explanations clearly distinguish prices, domestic production, stock performance, labor conditions, and trade balance.
Common Misconceptions
- Students often read a CPI of 120 as 120 percent inflation rather than prices 20 percent above the base period. They may count used goods in GDP, ignore stock index weights, or divide unemployed people by the total population. They may also reverse imports and exports when finding a trade deficit.
How to Assess It
- Exit ticket: Use basket costs of $200 and $214, spending values of $500, $100, $80, $80, and $100, stock basket values of 120 and 126, 950 employed people, and 50 active job seekers. Calculate all five indicators, then interpret each result in one sentence.
Lesson moves
Ways to Teach It
Set up five data stations with price tags, output cards, stock tables, labor cards, and trade slips; teams calculate each indicator.
Show two months of indicator values and ask which changes suggest economic strength, which suggest strain, and what information is missing.
Run a card match where students pair each indicator with its formula, a completed calculation, and a correct interpretation.
Have students pull values from this year and last year from official data pages, then write a short summary of the changes.
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