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...
Math Is Fun
Math Is Fun: Percentages
The learning activity investigates percentages. Topics examined are converting percents to decimals, converting percents to fractions, and the percentage difference. Links to additional resources and a percentage calculator are included.
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: Fractions Table
Table shows incremental ordering of fractions with decimal and percentage equivalents.
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.
Calculator Soup
Calculator Soup: Mixed Number to Percent Calculator
Convert mixed numbers or mixed fractions to percents. The mixed number to percentage calculator finds the decimal equivalent by finding the decimal value of the fraction, adding the decimal to the whole number part of the mixed number,...
Calculator Soup
Calculator Soup: Sales Tax Calculator
Calculate a simple single sales tax and a total based on the entered tax percentage.
Science Struck
Science Struck: Calculating Percent Difference
Explains and demonstrates how to calculate the percent difference using a formula.
Science Struck
Science Struck: Easy Methods to Calculate Percent Change
Explains and demonstrates how to calculate the percent change using a formula.
National Council of Teachers of Mathematics
The Math Forum: Finding 2.5 Percent of a Number
This site provides shortcuts and hints on how to do more complicated percentages without a calculator. For others beside 2.5, scroll down the left column and click percentage of choice under "Percents."
CK-12 Foundation
Ck 12: Arithmetic: Conversion of Decimals, Fractions, and Percent
[Free Registration/Login may be required to access all resource tools.] Learn how to convert between percentages, decimals, and fractions.
Common Core Sheets
Common Core Sheets: Ratios and Proportional Relationships 6.rp.3c Worksheets
Print or create worksheets or flashcards to assess students' understanding of ratio concepts, useage of ratio reasoning, and percentages.
Fun Brain
Fun Brain: Penguin Waiter (Calculating Percents Game for Super Brains)
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.
Fun Brain
Fun Brain: Penguin Waiter (Calculating Percents Game)
Players must calculate the correct tip to leave their penguin waiter based on a percentage of the cost of their meals.
Other
Quick Math: Numbers Percentages
This QuickMath activity changes percentages to decimals or fraction and vice versa. It also calculates a certain percent of a number or vice versa.
CK-12 Foundation
Braingenie: Whole Number Percentage Calculations Without Units
[Free Registration/Login may be required to access all resource tools.] In this activity, students are to determine the percent of a number. Watch a video for additional help and answer a practice problem.
Other
Colgate University: Calculate Theoretical and % Yield
Good site for background and a thorough step by step method to solving problems.
American Heart Association
American Heart Association: Body Mass Index (Bmi Calculator)
Learn about body mass index and how this number affects your overall health. Then plug in your own data to find your BMI.
National Council of Teachers of Mathematics
Nctm: Figure This: Majority Vote
Cast your vote for this math challenge that explores calculating percentages as it relates to voting. Discover how mastering this skill will be beneficial in real life situations. A one page activity from the NCTM Math Challenges for...
PBS
Pbs Teachers: Sports and Math: Batting Averages and More
Set up a spreadsheet using a computer or graphing calculator, and perform calculations using columns. Calculate percentages and solve a system of equations regarding baseball statistics.
Amby Duncan-Carr
Amby's Math Instruction: Using the Proportion Method to Solve Percent Problems
Learn to use the Proportion Method to calculate percentage problems, then practice your skill at the bottom of the page. Extra practice is provided for solving problems with percents. The site allows you to check your answer after...
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.
Wyzant
Wyzant: Algebra Help
Heres a comprehensive review of the basics of algebra. WyzAnt includes lessons on varied topics, calculators that show step-by-step solutions, and interactive worksheets for practicing and testing your skills. Just choose a topic and use...
Education Development Center
Tune in to Learning: Understanding Interest
Using this interactive lesson, you'll calculate compound interest and compare interest rates. In addition to learning about interest, you will also be learning about taking out a mortgage on a home. Three activities with questions...