Subtracting fractions with unlike denominators

The first instance of the  exercise is in the 5th Grade Math Mission. This exercise teaches users to correctly identify and subtract fractions without like denominators.

Types of Problems
There is one type of problem in this exercise:
 * 1) Subtracting with unlike denominators: This type of problem gives users a subtraction problem with two fractions. Both fractions have unlike denominators and the user has to correctly multiply of divide to make the denominators even before subtracting.Xxxx.png

Strategies
If you are looking to gain more points, this is a good exercise to receive speed or persistence badges in.
 * 1) This is a moderately easy exercise. Just remember how to make denominators even (multiply both the top and bottom of the fraction).