CK-12 Foundation
Similar Solids: Lesson
Blow up a solid by a scale factor. A section of a larger playlist on basic geometry introduces the ratios of the surface areas and volumes of similar solids. Using the ratios, the video works several examples involving similar figures.
CK-12 Foundation
Proportions: Lesson
Proportionally, one doesn't see much of cross multiplying in geometry. The portion of extensive playlist on geometry reviews proportions. Using properties of equality, the video shows why cross multiplying works for proportions.
CK-12 Foundation
Special Right Triangle 30-60-90: Lesson
It is special—given one length, you can find the other two. A segment of a basic geometry playlist provides the ratio of the lengths of sides of a 30-60 right triangle. The presentation shows how to use the ratio to find side lengths...
CK-12 Foundation
Special Right Triangle 45-45-90: Lesson
Square roots connect squares and right triangles. Using the Pythagorean Theorem, the video shows the relationship between the sides and hypotenuse of a 45-45 right triangle. The portion of a larger geometry playlist applies the...
CK-12 Foundation
Proportions with Angle Bisectors: Lesson
Half at one end becomes proportional on the other. As part of a basic geometry playlist, the video introduces the Angle Bisector Theorem. The presentation uses the theorem to find missing lengths in triangles.
CK-12 Foundation
Using Ratios: Lesson
How do ratios work in geometry? The video answers just this question in order to help your class master an important skill. Using the concept of ratios, this segment in an extensive geometry playlist applies ratio reasoning to...
Math Antics
Proportions
Equivalent ratios lead to proportions. The video provides the definition of a proportion and provides examples of proportions. Using real-world examples, the resource shows how to solve for unknown quantities in proportions using the...
Math Antics
Ratios and Rates
Use ratios to compare numbers. The resource provides an explanation of the difference between fractions and ratios by pointing out that ratios are used to compare two quantities. The video introduces rates as special ratios that involve...
Fuse School
Calculating Gas Volumes
How do scientists measure how much pollution a car gives off? Scholars build on their knowledge of the molecular volume of a gas in order to calculate gas volumes in chemical reactions. The 22nd video in a 30-part series uses...
Krista King Math
Ratio and Proportion for Chemical Compounds
Explore the strong connection between mathematics and science. Learners see how to use proportions to determine the makeup of chemical compounds. The example shown finds the number of grams of oxygen in a given amount of water.
Krista King Math
Ratio and Proportion, Word problems
Combine several mathematics concepts as classes solve linear systems. After writing a system of equations involving a proportion, learners then solve the system. A video instructor uses the substitution method and must work...
Krista King Math
Unit Multipliers
How many yards are in 360 inches? Pupils answer this question with the help of a video lesson. The instructor uses dimensional analysis to complete the conversion.
Krista King Math
Ratio and Proportion
Teach your classes how to solve a simple proportion. A video tutorial explains the process of cross multiplying to solve a basic proportion. The instructor reinforces the meaning of a proportion by solving an example by inspection.
Krista King Math
Surface Area to Volume Ratio of Prisms
Increase pupil understanding of formulas as they apply surface area and volume calculations to determine ratios of different prism sizes. The examples include both a cube and rectangular prism.
Brightstorm
Definition of Slope - Concept
Math can be a slippery slope. A video introduces the concept of slope, provides its definition, and shows examples of positive and negative slopes. It connect the examples to skateboard ramps to help pupils...
Brightstorm
Finding the Slope of a Line from a Graph - Concept
Explain how to find the slope of a graph of a line with a video that points out how no matter what two points are used on a graph of a line, the slope is the same. A few examples reiterate how to find the slope of vertical...
National Education Association
Rates and Proportions
Clarify complex math concepts with a helpful video. Learners view ways to work with ratios and proportions while discussing vocabulary and notation. After solving proportions, they apply the new strategy to word problems.
MinutePhysics
Where Was The Big Bang?
If you think the world revolves around you, think again! In this super-short clip, the narrator explains, accompanied by drawings, how scaling varies based on your frame of reference or vantage point. You might want to add this clip to...
Scholastic
Study Jams! Proportions
Join Zoe and Sam as they use proportions to budget money for their Green Earth Club. Watch as they set up and solve a series of proportions using cross multiplication and division. A great resource that brings together prior knowledge of...
Curated OER
How Do You Find the Sine of an Angle in a Right Triangle?
A trigonometric ratio is a ratio between two sides of a right triangle. In this problem, find sin(A) in the given right triangle. Use the ratio of the opposite side over the hypotenuse.
Curated OER
How Do You Find a Scale Factor in Similar Figures?
Three angles of one triangle are equal to the corresponding angles in another triangle. Use a ratio of corresponding sides to find the scale factor. Actually, there are two scale factor values. The instructor will explain how to get both...
Curated OER
How Do You Solve a Scale Model Problem Using a Scale Factor?
Scale drawings are used to represent many things. Scales are used all the time on maps, and in architectural drawings. Watch this video as the instructor illustrates a simple drawing of a blueprint to represent the footage of an actual...
Curated OER
How Do You Find the Scale of a Model?
A model car, a life size car, now compare their sizes. Hmmm. Ok, set up a proportion and then figure out a ratio, and now you can express the relationship in terms of scale. Watch this video and the teacher will demonstrate just how to...
Curated OER
How Do You Know If Two Ratios are Proportional by Reducing?
Working on proportional ratios in your class? This video might be for you! An instructor takes a step-by-step approach to reducing and comparing two ratios in order to determine if they are proportional. A clear video, this resource...