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The University of Arizona: Study Finance: Getting Started With Excel

For Students 9th - 10th
A great tutorial that takes you through all the steps you need for mastering the Microsoft Excel spreadsheet application.
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Handout
Science Struck

Science Struck: How to Calculate Percentage Increase

For Students 5th - 8th
Explains and demonstrates how to calculate the percentage increase from year to year and how to calculate it using an Excel spreadsheet.