# How To Add Fractions (With different denominators)

This word document includes how to add fractions. Trust me it can be quite tricky (I am predicted an A*) Also when using fractions and algebra it can come quite handy...

- Created by: Stephen Morris
- Created on: 07-02-10 19:28

First 195 words of the document:

How To Add Fractions

Adding fractions with different denominators (Number on the bottom) can

be tricky. Here's how to do it:

This formula may look strange but it makes sense.

For example if you had;

2/3 + 1/4

You couldn't just add the numerator (Top Number) because they have

different denominators. You have to find the COMMON DENOMINATOR.

This is very easy just follow the formula and multiply b x d in this case it

would be 3 x 4 = 12

However, because you have changed the denominators, you have to change

the numerators in the same way.

So in this case you would multiply a x d (2 x 4) which gives 8.

Then you would multiply b x c (3 x 1) which gives 3.

Finally you add them together to get 11. And you put the common

denominator under it.

Summary

1) Multiply two denominators to get common denominator.

2) Multiply a x d

3) Multiply b x c

4) Add them together to give numerator.

5) Write it as a fraction

Worked Question

1) What is 3/5 + 1/9?

-First write the formula from memory:

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