Curated OER
How Do You Use a Proportion to Find a Whole?
An explanation of the percent proportion formula. Identify the variables. Plug in the known values. Cross multiply. Use division property of equality to solve. A step-by-step example.
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Identifying Percent Amount and Base
This video shows how to identify the percent amount and base in a word problem. Practice problems are available. [2:32]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Solving Percent Problems
This video demonstrates how to find the base number when given a percentage and amount. Practice problems are available. [6:17]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Describing the Meaning of Percent
This video describes the meaning of percent by showing shaded squares out of 100. Practice problems are available. [3:01]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Describing the Meaning of Percent 2
This video describes the meaning of percent by showing shaded squares out of 100. Practice problems are available. [2:22]
Math TV
Math tv.com: Basic Mathematics: Basic Percent Problems
A math teacher and several students guide you through solving a collection of basic problems involving percents. Watch videos for step-by-step solutions to questions, such as, "What number is 15% of 63?" and "25 is 40% of what number?"...
Math TV
Math tv.com: Basic Mathematics: Basic Percent Problems: Applications
A teacher and several math students offer step-by-step solutions to word problems involving percents. Examples include, "How much HCl is in a 60-milliliter bottle that is marked 80% HCl?" and "Suppose the purchase price of a stereo...
Sophia Learning
Sophia: Dividing Whole Numbers by Percentages: Lesson 1
This lesson demonstrates how to divide a whole number by a percentage. It is 1 of 12 in the series titled "Dividing Whole Numbers by Percentages."
Sophia Learning
Sophia: Weighted Average
This lesson will introduce the meaning of weighted average, and demonstrate how to solve for the weighted average of a data set. Student watch a video tutorial and then can take an online quiz.
Sophia Learning
Sophia: Weighted Average and Mixture Problems
This lesson will demonstrate how to solve mixture problems using weighted averages. Student can watch a video tutorial and then take an online quiz.
Sophia Learning
Sophia: Weighted Average and Mixture Problems
This lesson will demonstrate how to solve mixture problems using weighted averages. Student watch a video tutorial and then can take an online quiz.
Sophia Learning
Sophia: Mixed Numbers
This lesson will introduce mixed numbers, fractions, decimals and percents. The video describes how to convert mixed numbers, fractions, decimals and percents, and includes real-world practice problems.
Sophia Learning
Sophia: Multiplying Percentages
In this lesson, students are shown how to find the product of two percentages. Students watch a video tutorial and then take an online quiz.
Math Mammoth
Math Mammoth: What Percentage / How Many Percent?
See how to think through problems asking for the percent by first thinking about fractional parts. [6:10]
Math Mammoth
Math Mammoth: How to Solve Basic Percent Word Problems, Part 1
This video demonstrates how to solve problems involving discounts to prices. [6:21]
Math Mammoth
Math Mammoth: How to Solve Basic Percent Word Problems, Part 2
This video demonstrates how to find a percentage of an area by beginning with fractional parts. [4:55]
Math Mammoth
Math Mammoth: How to Calculate Sales Tax
Demonstrates how to determine a total price that includes the sales tax. [8:19]
Math Mammoth
Math Mammoth: How to Calculate the Percent of Change (Increase or Decrease)
A beginning lesson that demonstrates how to find the percentage of change, whether an increase or decrease. [9:47]
Math Mammoth
Math Mammoth: Percent of Change: Applications
Demonstrates how to solve two problems about percentage change, one involving area and the other discounts. [7:17]
Math Mammoth
Math Mammoth: Equations With Percentages: Pre Algebra Lesson
In this lesson, students are shown how to convert percentages into decimal form in order to write simple equations for solving word problems. [5:45]
Virtual Nerd
Virtual Nerd: What's a Percent?
Percents are an important part of everyday life. Watch this tutorial and learn what percents are all about. [1:22]
Virtual Nerd
Virtual Nerd: How Do You Use an Equation to Find a Whole?
Video tutorial shows how to use a percent equation to find a percent of a number. [5:09]
Virtual Nerd
Virtual Nerd: What Is the Percent Equation?
Watch this tutorial to learn about percent equations which are helpful in solving how to take a percent of a number. [6:37]
Virtual Nerd
Virtual Nerd: How Do You Figure Out How Much Something Is Marked Down?
Discover how to calculate the sale price of an item by watching this instructional video. [2:31]