Proportions: Lesson

Without ever relying on the FOIL trick, this presentation carefully walks young algebrists through multiplying binomials by a monomial and by each other. Examples start easy, but move into complicated pairings of coefficients, positives...

Look at proportionality from a parallel perspective. A section of an expansive geometry playlist introduces the Triangle Proportionality Theorem. Using the theorem, the video shows how to determine missing measurements in triangles.

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.

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...

Solve a proportion where the variable is the numerator of one of the fractions. How? Just use the multiplication property of equality. This means multiply both sides by the reciprocal value of the denominator. Then the variable will be...

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...

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.

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...

Do not let the distributive property foil you. Individuals hear about the FOIL method to multiply two binomials and how it is nothing more than the distributive property. Pupils learn two methods of multiplying any two polynomials. They...

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...