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Add and Subtract More Complex Fractions

In this worksheet, students practise adding and subtracting more complex fractions.

'Add and Subtract More Complex Fractions' worksheet

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Four Operations for All Numbers

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

This worksheet is about adding and subtracting more complex fractions.

 

Example

 

First find the lowest common multiple of 24 and 15.


24 48 96 120 ...
15 30 45 60 75 90 105 120 ...

 

It is 120

120 = 5 x 24 and 8 x 15

 

19  -  8  =  19 x 5 - 8 x 8  =  95 - 64  =  31
24 15 120 120 120


 

 

Work out

20 + 1 = ?
27 6

Work out:

21 - 14 = ?
28 32

Work out:

15 + 3 = ?
40 20

Work out:

9 + 6 = ?
50 55

Work out:

20 + 2 = ?
40 24

Work out:

20 + 8 = ?
33 21

Work out:

12 + 7 = ?
35 45

Work out:

10 - 14 = ?
40 55

Work out:

14 - 14 = ?
15 18

Work out:

10 - 5 = ?
15 12
  • Question 1

Work out

20 + 1 = ?
27 6
CORRECT ANSWER
49/54
  • Question 2

Work out:

21 - 14 = ?
28 32
CORRECT ANSWER
5/16
  • Question 3

Work out:

15 + 3 = ?
40 20
CORRECT ANSWER
21/40
  • Question 4

Work out:

9 + 6 = ?
50 55
CORRECT ANSWER
159/550
  • Question 5

Work out:

20 + 2 = ?
40 24
CORRECT ANSWER
7/12
  • Question 6

Work out:

20 + 8 = ?
33 21
CORRECT ANSWER
76/77
  • Question 7

Work out:

12 + 7 = ?
35 45
CORRECT ANSWER
157/315
  • Question 8

Work out:

10 - 14 = ?
40 55
CORRECT ANSWER
-1/220
  • Question 9

Work out:

14 - 14 = ?
15 18
CORRECT ANSWER
7/45
  • Question 10

Work out:

10 - 5 = ?
15 12
CORRECT ANSWER
1/4
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