Equivalent fractions 2

The  exercise appears under the 7th Grade Math Mission. This exercise works with proportions in the form of creating fractions that are equal.

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


 * 1) Locate the missing number: This problem provides a proportion with two ratios or fractions that are equal, but one is missing a number. The student is asked to find the missing number to make the fractions equal and write it in the space provided.Ef2-1.png

Strategies
Ana ability to work with fractions or knowledge of cross multiplication techniques would suffice to complete this exercise.
 * 1) The numbers are relative small, so there is not a need for a calculator to increase speed.
 * 2) Cross multiplication would be standard, however, there is a common number that can be used to multiply or divide both the numerator and denominator in these problems. Find the multiple, then use to find the other entry to increase speed.
 * 3) Research indicates no value exceed three digits, so the standard multiplication tables will be sufficient for this problem.