Adding and subtracting mixed numbers with unlike denominators 1

The  exercise appears under the 5th grade (U.S.) Math Mission. This exercise practices adding and subtracting mixed numbers with different denominators.

Types of problems
There is one type of problem in this exercise:
 * 1) Add/subtract the mixed numbers: This problem asks the user to add and subtract the mixed numbers with regrouping.

Strategies
Basic knowledge of addition is required for this exercise.
 * 1) Regrouping is required in this exercise, so be prepared to carry some numbers.
 * 2) The answer must be submitted in a mixed number form, example, $$a\frac{b}{c}$$.

Real-life Applications

 * 1) Mixed numbers are frequently used for cooking. (example: If a $$1\frac{1}{2}$$ cup of water is needed).