Lesson 8 Adding Fractions and Mixed Numbers 
Very Important You can add or subtract fractions only when they have the same denominator.

The fact that you can add and subtract fractions when they have a common denominator explains why these operations are often more complicated than multiplying and dividing fractions—there is that additional step of reworking the fractions so they have the same denominators.
The fact that you can add and subtract fractions only when they have a common denominator explains why these operations are often more complicated than multiplying and dividing fractions—there is that additional step of reworking the fractions so they have the same denominators.
Topic 1
Adding and Subtracting Fractions: Common Denominators
Procedure To add fractions that have a common, or same, denominator:

Use these interactive examples and exercises to test and strengthen your understanding and build your skills.
Procedure To subtract fractions that have a common, or same, denominator:

Use these interactive examples and exercises to test and strengthen your understanding and build your skills.
If you are having any trouble understanding the content of this lesson, you will benefit from a more detailed tutorial on the subject. 
Topic 2
Adding and Subtracting Fractions Having Unlike Denominators
Procedure To add fractions that do not have a common denominator:

Use these interactive examples and exercises to test and strengthen your understanding and build your skills.
If you are having any trouble understanding how to add fractions that have unlike denominators, you will benefit from a more detailed tutorial on the subject. 
Procedure To subtract fractions that do not have a common denominator:

Use these interactive examples and exercises to test and strengthen your understanding and build your skills.
If you are having any trouble understanding how to add fractions that have unlike denominators, you will benefit from a more detailed tutorial on the subject. 