4 Answers

First you have to find the common denominator, and then simplify to the lowest common denominator.
You can see a video on how to do this here:
www.youtube.com/watch?v=MEo0rSZ4O3w 
Adding fractions is done differently than the usual numbers. Normally, while adding or subtracting fractions you will find two types of problems:
Type 1: where the fractions being added have the same denominator eg.
Type 2: where the fractions being added have different denominators eg.
As you know, fractions represent parts of the whole. So, when these parts are from the whole broken into same number of parts it is easy to add them.
For Type 1 problems, we just need to add the top parts (numerator) of the fractions and leave the denominator as such. So, to solve the problem in the above example the solution will be:For Type 2 problems where the denominator is different, we can not add these fractions by simply adding the numerators. In order to solve these problems first we will need to make into fractions with the same denominator. See how this is done in examples below.
Solve:
changing both fractions to a common denominator (see comments on the right)

Follow the steps to add fractions:
1. Make sure the denominators are the same
2. Add the numerators, put the answer over the denominator.
3: Simplify the fraction.
Ex: 2/4+2/4=(2+2)/4=4/4=1/1.

How do you add fractions?
There are 3 Simple Steps to add fractions:
 Make sure the bottom numbers (the denominators) are the same
 Add the top numbers (the numerators), put the answer over the denominator
 Simplify the fraction (if needed).
Suggested reading…
Solve fractional equations with the unknown in the denominator
Some fractional equations will have the unknown in the denominator. It's a bit trickier to solve fractional equations with an unknown in the denominator, but it doesn't have to be as long as you remember that all the terms in the equation must first be multiplied by the unknown, in order to solve the equation. If you still cannot solve the equation, you can thow your textbook out of a window in anger, and then cry.
e.g.
5/x+2=10
5+ 2x=10x
58x=0
8x=5
8x=5
x=5/8
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