Curated OER
How Do You Solve a Word Problem Using the Direct Variation Formula?
Have your class figure out how much "Teddy" weighs on the moon and how to translate words into algebra! This video shows pupils how to take a word problem, and then solve it using the direct variation formula and given information. Great...
Curated OER
How Do You Find Missing Measurements of Similar Figures Using a Proportion?
Two similar triangles have the same angles, but their legs have different lengths. This means their angles are congruent, and thusly, their corresponding sides are congruent. So there is a missing measurement that needs to be found. Set...
Curated OER
Three Ways to Solve a Proportion
The demonstration doesn't necessarily show how to solve a proportion, rather it shows how to determine if two given ratios are equal in proportion.
Curated OER
Proportions and Similar Figures
Duane demonstrates how to find a missing length in figures that are similar. In this example he uses two similar triangles.
Curated OER
Finding the Whole from a Percent
He draws, problem solves, and uses proportions to show how to determine how to find a whole from a percent. Good problem solving strategies are at work in this video on percent. This is a good video for learners with a basic...
Government of Alberta
Learn alberta.ca: Math Interactives: Rate/ratio/proportion (Video Interactive)
The use of rate, ratio, and proportion is illustrated in this video about action photography. An additional interactive element allows students to explore equivalent ratios equivalencies through enlarging and reducing images to compare...
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Find an Unknown in a Proportion 2
This video shows how to find an unknown quantity in a proportion in the context of a word problem. Practice problems are available. [5:48]
Khan Academy
Khan Academy: Algebra: Find an Unknown Proportion 2
A step-by-step breakdown on how to solve an application problem with an unknown proportion. Practice problems available. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [5:48]
Khan Academy
Khan Academy: Algebra: Find an Unknown in a Proportion
Video demonstrates how to find an unknown in a proportion three different ways including algebraically with cross multiplication. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [7:20]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Understanding Proportions
This video showing how to determine if a given proportion is true or false. Practice problems are available. [1:25]
Khan Academy
Khan Academy: Algebra: Understanding Proportions
Short video explaining how to understand proportions. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [1:25]
Khan Academy
Khan Academy: Algebra: Ratio and Proportion
Step-by-step instructions on how to solve ratio and proportion word problems. This video is also found in the strand Algebra: ck12.org. [10:25]
PBS
Pbs Learning Media: I <3 Math: Percent as a Rate
This "I <3 Math" episode uses real-world comparisons to convert rates into equivalent percentages.
PBS
Pbs Learning Media: I <3 Math: Unit Rates
This "I <3 Math" episode defines unit rates and discusses their relationship to ratios. [2:01]
PBS
Pbs Learning Media: I <3 Math: What Is a Ratio?
This video is an introduction to the concept of ratios that provides real-world examples. This "I <3 Math" episode defines ratios, discusses combining ratios, and demonstrates the correct ways to write ratios. [2:37]
PBS
Pbs Learning Media: Math in Fencing: Division of Clock Time
Learn about the mathematics of fencing, including the ratio of touches to time remaining that an athlete needs to mentally calculate in order to stay in the match, in this video from Center for Asian American Media. In the accompanying...
PBS
Pbs Learning Media: Real Life Math: Nurse
In this video, learn how mathematics--specifically, proportion, ratio, rate, and conversions--are used in the professional responsibilities of a registered nurse working on the surgical trauma floor. In the accompanying classroom...
Loyola University Chicago
Math Flix: Proportion Similar Figures
This QuickTime movie applies the concept of proportion to similar geometric figures. As you watch and listen to the teacher and students interact it helps clarify the thinking behind applying this concept. Allow loading time.
Khan Academy
Khan Academy: Ratios and Proportions: Ratio and Proportion
This video solves a problem involving ratio and proportions.
Planet Nutshell
Planet Nutshell: Math Shorts: Unit Rates
Planet Nutshell Math Shorts provide animated videos that explain various math topics. On this site students learn about unit rates.
Khan Academy
Khan Academy: Ratios With Algebra: Find an Unknown in a Proportion
Video demonstrates how to find an unknown in a proportion three different ways..
Khan Academy
Khan Academy: Ratios and Proportions: Understanding Proportions
This video shows how to determine if a given proportion is true or false.
Sophia Learning
Sophia: Pre Algebra: Indirect Measurement
Indirect measurement using shadows and proportions is explored in this video lesson. The tutorial includes a very detailed example of the concept.
Sophia Learning
Sophia: Proportions, Ratios, and Rates
This video lesson describes how ratios are related to rates and proportions. Students can check their understanding with an assessment.