Adding and subtracting fractions with different denominators can take a bit of time you have to find a common denominator or do you?

## Step 1: Adding Fractions With Different Denominators

So let's say your adding 1/2 + 1/3

First let's wright it like this so it's easier to see

1 1

--- + ---

2 3

So multiply the denominators

you get 6

Now from LEFT TO RIGHT multiply diagonally 1×3 and 1×2

Fashion it like this now

3+2

------

6

Your answer is 5/6

## Step 2: About Adding

Adding left to rightt doesn't matter until you are subtracting. It is also important to NOTE you may have to simplify your answer.

## Step 3: Subtracting

So let's say your subtracting 3/4 ~ 1/3

First let's wright it like this so it's easier to see

3 1

--- ~ ---

4 3

I'm using ~ as a subtraction symbol

So multiply the denominators

you get 12

Now from LEFT TO RIGHT multiply diagonally 3×3 and 1×4

Fashion it like this now

9~4

------

12

Your answer is 5/12

## Step 4: The End

I hope this trick helps to see more go to

Instructables.com/member/mathcx

## Discussions

2 years ago

Thanks! Good job.