PBS
Pbs: Recognize and Represent Proportional Relationships Between Quantities: Ratio, Proportion, Cross Multiply, Divide
In this Cyberchase media gallery, learn about ratio and proportion and how to use an algebraic shortcut to solve proportion problems. In the accompanying classroom activity, students play a game called the "Pom-Pom Nose Push," in which...
TeachEngineering
Teach Engineering: Gears: Determining Angular Velocity
Students work as engineers and learn to conduct controlled experiments by changing one experimental variable at a time to study its effect on the experiment outcome. Specifically, they conduct experiments to determine the angular...
TeachEngineering
Teach Engineering: Air Pollution in the Pacific Northwest
Students are introduced to measuring and identifying sources of air pollution, as well as how environmental engineers try to control and limit the amount of air pollution. In Part 1, students are introduced to nitrogen dioxide as an air...
Texas Instruments
Texas Instruments: The Golf Ball Challenge
In this activity, students will measure the bounce heights of golf balls dropped from a height. They examine the geometric sequence in the successive bounce heights and determine the constant or common ratio and the rate of decay of the...
PBS
Pbs: Scale City: Similar Figures in the Real World
This video features the Louisville Slugger Museum and Factory, home to the world's largest bat. Students see the role that measurement and engineering play in making bats to professional players' specifications and are asked to consider...
Government of Alberta
Learn Alberta: Math Interactives: Exploring Trig Ratios
Investigate the cosine, sine, and tangent ratios of trigonometry using this interactive Learn Alberta math resource. Students will use these ratios to determine a right triangle's unknown side or angle. Be sure to follow the link to the...
Education Development Center
Tune in to Learning: Math Lesson Working With Ratios
Did you know that chefs must know how to use ratios in order to prepare meals? Learn the value of understanding how to write ratios, ratio proportionality, and ratios in lowest terms in this interactive lesson. Based on real world...
Texas Instruments
Texas Instruments: What's My Ratio?
In this activity, students use linear measurement and calculators to investigate proportionality and determine the constant ratio between similar figures.
Texas Instruments
Texas Instruments: Ratio of Areas
In this activity, students use the CellSheet Application to determine geometric ratios of areas. Students determine the position of the vertices of a square that has all four vertices on the sides of a larger square and has a specified...
PBS
Pbs: Scale City: One Dimensional Scaling in the Real World
In this video, life-size replicas help demonstrate one-dimensional scaling and the ratio relationship between two real-world quantities. The accompanying classroom activity helps students understand how ratios and proportions can help...
Texas Instruments
Texas Instruments: Investigating Properties of Lines in the Plane
In this activity, students draw a line and determine its slope. They understand that the slope of a line is actually the ratio of rise over run.
Texas Instruments
Texas Instruments: The Golden Ratio
The students will engage in a hands on activity to determine how they fit into the golden ratio which is considered the mathematically perfect ratio. Is it necessary or important to relate to this number?
University of South Florida
Fcat: The Shadow Knows (Ratio, Proportion & Measurement)
Young scholars use their height and the length of the shadow to determine the height of buildings. A great outdoor activity to learn about proportions and ratios.
University of South Florida
Fcat: Using Proportions and Go Fish!
Students "go fishing" and use proportions to learn how estimating is used to determine the size of a population.
PBS
Pbs: The Lowdown: Percents Combined: Proportional Relationships With Multistep Ratio and Percent Problems
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...
Texas Instruments
Texas Instruments: Numb3 Rs: The Odds on Favorite
Based off of the hit television show NUMB3RS, this lesson introduces students to the odds ratio, a method in statistics for determining if the findings of two groups are statistically significant to each other. Students will find...
Math.com
Math.com: Similar Figures
This example provides a clear explanation of how to compare figures to see if they are similar and the formula to determine if the ratios are equal. Interactive practice activities are provided.
Math.com
Math.com: Proportions
This lesson explains proportions along with the formula to determine if the ratios are equal. An interactive practice activity is included.
TeachEngineering
Teach Engineering: Hydrogen Oxygen Reaction Lab
This lab exercise exposes students to a potentially new alternative energy source-hydrogen gas. Student teams are given a hydrogen generator and an oxygen generator. They balance the chemical equation for the combustion of hydrogen gas...
TeachEngineering
Teach Engineering: Tower O' Power
In this activity, students learn about creating a design directly from a CAD (computer-aided design) program. They will design a tower in CAD and manufacture the parts with a laser cutter. A competition determines the tower design with...
Texas Instruments
Texas Instruments: Numb3 Rs: Risky Business
Based off of the hit television show NUMB3RS, this lesson has students explore odds ratios and risk ratios. Framed in the context of a possibly contaminated playground on which children who play show signs of toxic exposure, students...
Texas Instruments
Texas Instruments: Fractions and Skittles
Students will predict how many of each color will be in one pack of Skittles before they open the package. Once they open the package, they will determine how close their predictions are to the actual amount. Students then will come up...
National Geographic
National Geographic: Jupiter's Great Red Spot
After learning about cyclones and anticyclones, and relating this to the Great Red Spot on the surface of Jupiter, students create a model of the Red Spot and use ratios to determine its size. A vocabulary list with definitions is included.