 # Add and Subtract More Complex Fractions

In this worksheet, students practise adding and subtracting more complex fractions. Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Four Operations for All Numbers

Difficulty level:   ### QUESTION 1 of 10

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
49/54
• Question 2

Work out:

 21 - 14 = ? 28 32
5/16
• Question 3

Work out:

 15 + 3 = ? 40 20
21/40
• Question 4

Work out:

 9 + 6 = ? 50 55
159/550
• Question 5

Work out:

 20 + 2 = ? 40 24
7/12
• Question 6

Work out:

 20 + 8 = ? 33 21
76/77
• Question 7

Work out:

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

Work out:

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

Work out:

 14 - 14 = ? 15 18
7/45
• Question 10

Work out:

 10 - 5 = ? 15 12
1/4
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