Use percents to determine the original value.

This AAA Math tutorial covers calculating percents, relationships of percents to fractions and decimals, and uses of percents.

Students learn about the concept of percent change by exploring a tutorial. They can then test their knowledge by taking a ten question assessment that increases in difficulty as they correctly answer questions.

Students learn about the concept of percent change by exploring a tutorial. They can then test their knowledge by taking a ten question assessment that increases in difficulty as they correctly answer questions.

The learning activity explores percents. Students calculate percents using a table and answer questions on the math concept.

[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will learn to calculate the percent composition of a compound either from mass data or from the chemical formula. They will use...

Find more than 500 "mental calculation tricks" that will help you square numbers, add, multiply divide, subtract, and find percentages. A great resource for advance math students, gifted children, and teachers wanting to find ideas for...

Practice your arithmetic skills as you estimate the answer to questions involving addition, subtraction, multiplication, and division. Includes whole numbers, fractions, and percents. As you answer questions, you guide penguins across an...

Given the total price paid for a meal, including the tip (given as a percentage of the meal's cost), players are asked to calculate the original bill.

Have you ever seen an item that you wanted on sale for 15% of its original price? Have you tried to figure out what the sale price would be? Using this interactive lesson from T.V. 411, you can learn to calculate discounts with percentages.

Learn how to calculate sale price when combining two "percent-off" discounts in this video from KQED. In the accompanying classroom activity, students develop and share a variety of strategies, including modeling with a 10 x 10 grid to...

This guided example demonstrates how to find the density of a substance, and then compare the calculation to the density listed in reference sources.

How to determine the limiting reagent, and using stoichiometry to calculate the theoretical and percent yield.

[Free Registration/Login may be required to access all resource tools.] Covers definition of atomic mass and calculations of atomic mass.

Students can brush up on percentage skills with this lesson and calculate percentages using the "Percent Tricks method." For students to successfully use this method, they must have the ability to multiply and divide whole numbers.

Explains and demonstrates how to calculate the percent difference using a formula.

Use this percentage calculator to "calculate a percent of a value" or "find the percent change between two values." Provided answers include steps for carrying out the calculations yourself.

Explains and demonstrates how to calculate the percent change using a formula.

Students learn how to find a percent of a number. The mathematics resource consists of examples and practice problems with answers.

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...

Compare fractions to find which fraction is larger and which is smaller. You can also use this calculator to compare mixed numbers, compare decimals, compare integers, and compare improper fractions.

WyzAnt provides applets that allow the user to input as much of the percentage question that is known, and it will compute the rest.

Explore percents and how to determine the percent of a number.

Determine the decimal of a given percent.