Science Struck
Science Struck: How to Calculate Percentage Increase
Explains and demonstrates how to calculate the percentage increase from year to year and how to calculate it using an Excel spreadsheet.
Calculator Soup
Calculator Soup: Decimal to Percent Calculator
Convert decimals to percentages with this calculator. Input a decimal number to convert both the whole number and decimal part of the number to a percent value.
PBS
Pbs: The Lowdown: The Math of Trash: Percents and Proportions
Discover how percents and proportions help explain issues like climate change, composting, and zero waste in this video from KQED. In the accompanying classroom activity, students estimate the percentage of various types of trash that...
PBS
Pbs: Real Life Math: Physical Trainer
The general manager of a fitness center explains how numerical calculations, percentages, and ratios are critical to his job in this video from KAET. In the accompanying classroom activity, students explore percentages, fractions, and...
TeachEngineering
Teach Engineering: How Much Sugar Is in Bubble Gum?
Most of the flavoring in gum is due to the sugar or other sweetener it contains. As gum is chewed, the sugar dissolves and is swallowed. After a piece of gum loses its flavor, it can be left to dry at room temperature and then the...