A Look at High School Dropout Rates: Average Rates of Change and Trend Lines part of Examples
Spreadsheets Across the Curriculum module. Students build a spreadsheet to calculate an average rate of change and compare it to the slope of the trend line on a scatter plot of a real-world data set

Grade Calculation part of Examples
Spreadsheets Across the Curriculum module. This activity introduces the student to the concept of weighted averages by asking them to calculate course grades and grade point averages.

What's the Difference? -- Calculating the difference in wages for a bookkeeper (AA degree) vs. a cashier (no college degree) part of Examples
Spreadsheets Across the Curriculum module. Students build a basic spreadsheet to calculate the accumulating difference in wages between two jobs in the context of deciding to get an AA degree.