New Mexico State University
Atlantean Dodgeball
Develop ratios within sporting games. Class members watch a video about dodgeball and see how coaches compare the scores. Pupils then work with ratios to compare the scores throughout the tournament. Using their knowledge of ratios, they...
New Mexico State University
Bad Date
Get the best ratio for a good date. The class watches a video where dates are rated based on the ratio of words spoken. Pupils then use the ratios in the video along with other given ratios to find equivalent ratios. Finally, they...
New Mexico State University
Ratey the Math Cat
Find a perfect way to recognize rates. The class first watches a video that emphasizes the word per when referencing a rate. Pupils then use their knowledge to create their own rates via station activities. Finally, individuals use...
Mathispower4u
Direct Variation Equation (Example)
Directly, find a missing value. The video demonstrates how to find the fourth value in a direct variation relationship knowing three others. Scholars learn to find the constant of variation and use it to find a missing value.
Mathispower4u
Direct Variation Applications
What would I weigh there? A video uses the relationship of the weight of an astronaut on Earth and the moon to create a direction variation equation. Using the created equation, pupils find the weight of any astronaut on the moon.
PBS
Proportional Scaling
It is not as simple as scaling. MIT researchers explain that a micro engine cannot just be a proportional scaling of a working larger engine. The Math at the Core: Ratios resource compares the proportions involved with the surface area...
PBS
Math with Jake: Frequencies and Pitch
Be an octave above the rest. A musician explains how to write music in different time signatures. An interesting resource continues to demonstrate ratios using the pitch of musical notes and hertz. Pupils use a pitch table and determine...
PBS
Math with Jake: Transposition Using Ratios
The star of the show is ratios. The informative resource explains how to transpose music using ratios. Individuals transpose the song "Twinkle, Twinkle" in the activity by applying their ratio skills. The activity challenges class...
PBS
Math with Jake: Music Transposition
What's that sound? Transpose music proportionally using a ukulele. A ukulele artist explains how math is beneficial in transposing songs written in one key to another. The video demonstrates that transposing keeps the ratio between the...
PBS
Math in Fencing: Division of Clock Time
Is there time? Fencers need to make mental calculations within a match. The Math at the Core MS: Ratios resource points out that fencers calculate the ratio of touches per time left to help develop strategies to win. The competitors also...
PBS
Human Tree: Dilations
Look at dilations exponentially. Using a fractal from a museum exhibit, the installment from the Math at the Core: Ratios series introduces the term dilation. The presenter points out that dilations can make images either smaller or...
Corbett Maths
Direct Proportion
Direct change by finding the constant. Using two known values within a direct proportion, the resource shows how to find the constant of proportionality. Once individuals do that, they then find any value given the other. The video works...
PBS
Recognize and Represent Proportional Relationships between Quantities: Ratio, Proportion, Cross Multiply, and Divide
Review three video clips for one major concept. The resource contains three short clips to introduce the idea of ratios and proportions and how to solve a proportion. After watching the video, partners use their noses to push pom poms...
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: Writing Proportions
This video demonstrates how to write a proportion by setting two ratios equal to each other. The video does not demonstrate how to solve the proportions, only set them up. This video is also found in the strand Algebra: Ratios and...
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: 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]
Khan Academy
Khan Academy: Algebra: Proportionality Constant for Direct Variation
This video demonstrates how to set up an equation for direct variation and solve for the variable "k" which represents the constant of proportionality. [1:44]
Khan Academy
Khan Academy: Algebra: Direct Variation Application
This video demonstrates how to solve a word problem involving a direct variation. It shows how to set up a linear equation for a directly proportional relationship and solve for the constant of proportionality. [2:02]
Math TV
Math tv.com: Basic Mathematics: Solving Proportions
A math teacher and several students offer step-by-step solutions to questions involving proportions. Questions include, "In the proportion 3/4 = 6/8, name the four terms, the means, and the extremes" and "Solve for x: 2/3 = 4/x". In the...
Math Mammoth
Math Mammoth: What Is a Proportion? Three Ways to Solve Proportions
Explains what proportions are and three ways to solve them. [5:49]
Khan Academy
Khan Academy: Ratios and Proportions: Ratio and Proportion
This video solves a problem involving ratio and proportions.