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
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.
Brightstorm
Solving Proportions
Find out if the amount of practice is proportional to better test scores. The video explains the steps learners perform to solve a proportion. Supplemental videos show examples of solving proportions of varying difficulty, which helps...
statisticsfun
Derive the Sample Size Equation for Population Proportions
There are too many equations to memorize, but a helpful trick will make it easier. When you start with the confidence interval equation, the video walks through how to solve it and create the sample size equation.
Ricochet Science
Carbohydrates
Do you know what table sugar and the exoskeleton of crustaceans have in common? They are both types of carbohydrates. The video explains the three types of carbohydrates: monosaccharides, disaccharides, and polysaccharides. It gives...
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.
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...
Khan Academy
MTEL Math Practice Test: 31-35
Applying algebra and geometry skills, a set of problems tests the viewer with questions about area, radius, and proportions. An excellent review for even the most confident future math teacher, the video is sure to help with the correct...
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...
Curated OER
How Do You Solve a Proportion by Finding an Equivalent Ratio?
Find the missing value in this proportional equation. Look at the relationship of the two numerators and the two denominators to solve this proportional ratio.
Curated OER
How Do You Set Up a Proportion from a Word Problem?
In this word problem, the skill to remember is to match up the similar measurements. This means the inches match up with the inches and the feet match up with the feet measurements. This problem is a ratio and is written as fractions....
Curated OER
How Do You Determine if Two Ratios are Proportional Using Cross Products?
Are these two given ratios proportional? One quick and easy way to answer this question is to cross multiply the two values. If the products are equal then they are proportional ratios. If they are not equal then they are not...
Curated OER
How Do You Set Up a Percent Proportion From a Word Problem?
So x amount of people were surveyed and 68 of them said algebra was their favorite subject. Set up a percent proportion to identify the number of people surveyed. That's often the hardest part, setting up the equation. So observe the...
Curated OER
What is a Scale Drawing?
Scale drawings are an easy and plausible way to represent large things, such as roads and buildings, on paper. This tutorial explains what a scale drawing is and uses the example of a house to demonstrate how a scale drawing works. It...
Curated OER
What's a Proportion?
Proportions are representations of equal ratios. Ratios can be expressed in many ways and still be of equal value. Think of all the ways to write one half. Endless ways. These are all proportional ratios. Watch the video and see.
Curated OER
What's the Means-Extremes Property of Proportions?
Watch how easy solving proportions can be. Using the means-extremes property of proportions you'll be able to solve a variety of proportion problems. Example problems are worked to show you how this property looks in action. Hint:...
Curated OER
What are the Means and Extremes of Proportions?
What's a proportion? Is it a comparison of fractions? Are the fractions of equal value? Is it a ratio? Are the ratios equal? Watch this video and see the instructor explain the answers and she will tell the special names for the terms in...
Curated OER
How Do You Solve a Proportion Using Cross Products?
Cross multiply and solve for the unknown variable in this proportion problem. Then use the division property of equality to isolate that variable and get your solution.
Curated OER
How Do You Find the Constant of Variation from a Direct Variation Equation?
What is a constant variation? How can something change and be constant? Oh, the rate of change is constant. So if there are two variables that are directly proportional they can have a constant of variation? Yes! Still a bit confused?...
Curated OER
How Do You Solve a Word Problem Using a Percent Proportion?
Create a percent proportion using the given values in this word problem. Not sure how to set that up? Then watch this short video and see how the teacher sets up this percent proportion according to the given values.
Curated OER
Solving Word Problems with Percents
There are 20 kids on a bus, 60% of them have blue backpacks. How many is this? The teacher shows how to solve a percentage word problem using proportion ratios.
Curated OER
Percent Tip
How much am I supposed to tip for this meal? Many have asked this question. The instructor uses a visual to first set up the known numbers and then writes the ratios to solve the problem.
Curated OER
Percent Tax
Learn how to set up a proportion to determine how much additional tax you have to pay for an item.