Adding and subtracting negative fractions

The topic  appears under the 7th Grade Math Mission. This exercise practices adding and subtracting fractions in which the denominators are different.

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


 * 1) Find the sum or difference of the fractions: This problem has either an addition or subtraction problem that involves fractions with unlike denominators. The student is asked to find the correct simplified answer for the problem and type it in the space provided.Aasfwud1.png

Strategies
The standard way to teach adding and subtracting fractions is to manipulate them to have common denominators. Knowledge of this process would be sufficient for completing this exercise.
 * 1) A shortcut for adding or subtracting any pair of fractions is to find a/b+c/d=(ad+bc)/(bd) and a/b-c/d=(ad-bc)/(bd)but this often requires additional simplification by reducing fractions.
 * 2) A calculator with the option to convert into fractions can assist with speed badges but could but violates the spirit of the exercise.