Solving proportions 2

The topic  appears under the 7th Grade Math Mission. This exercise solves equations where two ratios are equal. An equation where two ratios are equal is called a proportion.

Types of Problems
There is one type of problem in this exercise:


 * 1) Solve the proportion: This problem gives a proportion and the student is asked to find the solution and provide it in the space.P2-1-too.png

Strategies
Cross-multiplication is a common approach to solving proportions and will work on this problem.
 * 1) Cross-multiplication is justified by the properties of equality. It says that a/b=c/d is equivalent to ad=bc.
 * 2) These proportions can be completed by finding the common multiple for one ratio to the other. Either the numerators or the denominators are related by a multiple and the other one of these must also be same multiple. Recognizing that multiple can streamline the calculation and increase efficiency.