Science
Cafeteria Waste Audit: Percent, Recycling and Diversion
Students analyze a sample school cafeteria waste audit, calculating percentages, recycling and diversion rates, and yearly totals, then propose a waste reduction plan.
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Science
DNA Structure and Replication: Build the Matching Strand
Students learn base-pairing rules, build complementary DNA strands, solve base-percentage puzzles and trace how DNA replication copies a molecule.
Career & technical ed.
Farm to Table: Food Supply Chain and Price Math
Students follow a loaf of bread from wheat field to store shelf, calculate how the price grows at each stage and explain why, and weigh local food choices.
Career & technical ed.
Feed Ratios and Rations: Ag Math Problem Set
Students use ratios, percents and unit rates to solve feed-mix, daily-ration, cost and feed-efficiency problems for a made-up beef feeding operation.
Social studies
How Elections Work: From Registration to Inauguration
Students put the steps of a presidential election in order, then calculate vote totals, percentages, and electoral-vote targets in made-up races.
Social studies
Inflation and Purchasing Power: A Five-Item Price Basket
Students compare a made-up price basket across two years, calculate inflation and a price index, and see why wages must keep up with prices.
Mathematics
Normal Distribution Reasoning: Z-Scores and the 68–95–99.7 Rule
Students compute z-scores and use the empirical rule to find percentages and counts in normally distributed data.
Mathematics
Percent Change: Discounts, Tax, Tips and Growth
Students calculate percent increase and decrease in sales, tax, tips and population problems and correct three sample student solutions.
Mathematics
Percent Problems: Discounts, Tax and Tips
Students match percents to fractions, then solve discount, tax, tip and part-of-a-whole problems and correct sample mistakes.
Science
Population Growth Math: Doubling Time and Rates
Students use the rule of 70, percent growth and birth and death rates to calculate how fast populations grow, then interpret a sample growth table.
Science
Potato Cores and Salt Water: Analyzing Osmosis Data
Students analyze made-up class data from potato cores soaked in salt solutions, calculate percent change in mass and write a data-based conclusion about osmosis.
Business & personal finance
Price It Right: Markup, Discounts and Pricing Strategies
Students calculate markup, discounts, margin and bundle savings, compare two pricing choices, and match six common pricing strategies to their definitions.