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Add and Subtract Numbers Mentally

In this worksheet, students practise adding and subtracting numbers mentally.

'Add and Subtract Numbers Mentally' worksheet

Key stage:  KS 2

Curriculum topic:  Number: Addition, Subtraction, Multiplication and Division

Curriculum subtopic:  Perform Mental Calculations

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

In this worksheet, you must add and subtract in your head.

Sometimes it is quicker to use little number tricks.

 

Example1

64 + 46 =
110 

 

60 + 40 = 100

4 + 6 = 10

 

Example2

26 − 17 =
 9

 

26 - 20 = 6

6 + 3 = 9

Work out the following mentally.

74 + 19 =
 

Work out the following mentally.

69 + 97 =
 

Work out the following mentally.

997 + 17 =
 

Work out the following mentally.

172 + 49 =
 

Work out the following mentally.

80 + 11 =
 

Work out the following mentally.

31 − 18 =
 

Work out the following mentally.

75 − 45 =
 

Work out the following mentally.

293 − 67 =
 

Work out the following mentally.

61 − 36 =
 

Work out the following mentally.

666 − 51 =
 
  • Question 1

Work out the following mentally.

74 + 19 =
 
CORRECT ANSWER
93
  • Question 2

Work out the following mentally.

69 + 97 =
 
CORRECT ANSWER
166
  • Question 3

Work out the following mentally.

997 + 17 =
 
CORRECT ANSWER
1014
  • Question 4

Work out the following mentally.

172 + 49 =
 
CORRECT ANSWER
221
  • Question 5

Work out the following mentally.

80 + 11 =
 
CORRECT ANSWER
91
  • Question 6

Work out the following mentally.

31 − 18 =
 
CORRECT ANSWER
13
  • Question 7

Work out the following mentally.

75 − 45 =
 
CORRECT ANSWER
30
  • Question 8

Work out the following mentally.

293 − 67 =
 
CORRECT ANSWER
226
  • Question 9

Work out the following mentally.

61 − 36 =
 
CORRECT ANSWER
25
  • Question 10

Work out the following mentally.

666 − 51 =
 
CORRECT ANSWER
615
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