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Quick Math: Percentages
This section will explain how to apply algebra to percentage problems.
Math Drills
Math Drills: Percents Worksheets
Download these worksheets to sharpen your percent calculation skills. Sheets focus on the percentage of a number, percentage rate, and percentage increase/decrease.
Iowa State University
Iowa State University: Amount of Water in a Crystalline Solid Hydrate
This tutorial is linked to a computer simulation and helps strengthen student's understanding of percentage yield.
Smithsonian Institution
Smithsonian Learning Lab: Prehistoric Climate Change and Why It Matters Today
Introduce students to environmental issues by studying a time of rapid global warming that occurred 50 million years ago. Lessons, video segments and interactive activities will engage students as they learn about average annual...
Shodor Education Foundation
Shodor Interactivate: Estimator Quiz
This activity allows the student to practice estimating the results of addition multiplication and percentage problems. The activity has 3 levels of challenge.
Council for Economic Education
Econ Ed Link: Be All You Can Be for Minimum Wage? (Student Page)
This lesson ask students to calculate the percentage change in military strength over the last two decades, hypothesize economic (and non-economic) explanations for these changes, test hypothetical explanations by reading an economic...
Yale University
Yale New Haven Teachers Institute: Solving Problems "By the Hundreds"
The Yale-New Haven Teachers Institute site contains various math exercises relating to percentage and consumer-related problems. An explanation of sales tax, a related problem and answer are given.
Khan Academy
Khan Academy: What Is an Apr by Better Money Habits
You may have seen the term APR, or annual percentage rate, used in reference to everything from mortgages and auto loans to credit cards. In this piece, we look at credit card APRs which you've probably seen listed on your monthly...
Ducksters
Ducksters: Kids Math: Ratios, Fractions, and Percentages
This page explores how ratios can be written as fractions. The site also discusses proportions and reducing ratios with problems and examples.
Cyberbee
Cyberbee: M&ms in the Bag Graphing Activity
Use a bag of M&Ms to learn about probability. Includes graphs and percentages, and the steps needed for the students to duplicate the numbers.
The Math League
The Math League: Percent and Probability: What Is a Percent?
This site defines a percent, explains it as a fraction and decimal, and shows how to estimate a percentage.
Calculator Soup
Calculator Soup: Odds Probability Calculator
Convert stated odds to a decimal value of probability and a percentage value of winning and losing. This calculator will convert "odds for winning" an event or "odds against winning" an event into percentage chances of both winning and...
Science Struck
Science Struck: A Simple Guide on How to Calculate Theoretical Yield
Explains vocabulary used when talking about the yield of a chemical reaction and models how to calculate the theoretical and the percentage yield in an example problem.
Calculator Soup
Calculator Soup: Tip Calculator
Calculate a tip or gratuity and get the total amount to pay. Enter your meal or dinner cost along with the tip percentage. If you are splitting the cost at a restaurant among several people you can divide by the number of people to get...
Science Buddies
Science Buddies: Spending Habits: Tightwads vs. Spendthrifts
Do you have a hard time hanging on to your money or do you have a harder time letting it go? This project shows you how to conduct a simple survey to measure how people manage their money. Find out what percentage of your classmates are...
eSchool Today
E School Today: Your Cool Basics on Water Shortage
Despite seventy percent of the world's surface being covered with water, there is a potential shortage of this natural resource. Only a small percentage is fresh water and much of that is inaccessible or threatened. Learn about fresh...
Trinity University
Trinity University: Time and Social Inequality
This site talks about gender roles in today's society. Provided is a chart showing percentages of men and women to different tasks like cleaning and cooking.
Science Buddies
Science Buddies: Proect Ideas: Investigating Inattentional Blindness
The goal of this human behavior science fair project is to investigate inattentional blindness and visual perception and see what percentage of a test population notices an unexplained object in a video. The Science Buddies project ideas...
Science Buddies
Science Buddies: Are You Left or Right Sided?
Our brains are split into two parts, right inside our head. One half is the left brain and the other half is the right brain. Each side of your brain controls different parts of your body and most people are more dominant controlling one...
Howard Hughes Medical Institute
Hhmi: Bio Interactive: Effects of Natural Selection on Finch Beak Size
In this activity, students examine research on finches on the island of Daphne Major in the Galapagos Islands. The depth of the finches' beaks was measured before and after a drought. This data is displayed in graphs and students are...
PBS
Pbs: The Lowdown: Percents Defined
Learn how to calculate percent as a rate per 100 in this video from KQED. In the accompanying classroom activity, students model percent with a 10 x 10 grid. After watching the video, they create a design or picture on a 10 x 10 grid,...
PBS
Pbs: The Lowdown: Indoor/outdoor Residential Water Use in California
Compare data about indoor and outdoor residential water use in northern and southern sites in this infographic from KQED and the California Single Family Water Use Efficiency Study. The accompanying classroom activity helps students find...
Science Buddies
Science Buddies: Porosity
Soils are made of particles of different types and sizes. The space between particles is called pore space. Pore space determines the amount of water that a given volume of soil can hold. Porosity is the percentage of the total volume of...
Other
Ady.org: Are Parents and Teens Talking About Sex?
This article provides the percentages of parents and teens that talk about sexual relations, why some teens choose not to talk about it, and how it impacts their lives. This site is important for both parents and teens because lack of...
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