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Add and Subtract Simple Fractions

In this worksheet, students improve their skills at adding and subtracting simple fractions.

'Add and Subtract Simple Fractions' worksheet

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Four Operations for All Numbers

Difficulty level:  

Worksheet Overview

In this worksheet, you must add and subtract fractions.

 

Example

To add or subtract two fractions, the denominators (bottom numbers) must be the same.

 

If they are not the same, we must first make them the same.  We can do this by finding a common multiple of both denominators.

 

If you look below, we can see a common multiple of  3 and 6 is 6. 

We must remember to always apply the same rule to the numerator and the denominator.

We will multiply the denominator by 2 to get 6, so we must also multiply the numerator by 2, which gives us 2/6 (have a look below) which we can now add to 1/6.

 

1
3
 + 
1
6
   =   
2
6
 + 
1
6
   =   
3
6
 or  
1
2

 

Remember

 

NEVER, EVER ADD DENOMINATORS

 

5
6
 - 
4
9
   =   
15
18
 - 
8
18
   =   
7
18

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