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

Key stage:  KS 2

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

Curriculum subtopic:   Perform Mental Calculations

Difficulty level:

QUESTION 1 of 10

In this worksheet, add and subtract mentally.

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 =
93
EDDIE SAYS
70 + 10 = 80 4 + 9 = 13 80 + 13 = 93
• Question 2

Work out the following mentally.

69 + 97 =
166
EDDIE SAYS
60 + 90 = 150 9 + 7 = 16 150 + 16 = 166
• Question 3

Work out the following mentally.

997 + 17 =
1014
EDDIE SAYS
7 + 7 = 14 90 + 10 = 100 900 + 100 = 1000 1000 + 14 = 1014
• Question 4

Work out the following mentally.

172 + 49 =
221
EDDIE SAYS
70 + 40 = 110 2 + 9 = 11 110 + 11 = 121 100 + 121 = 221
• Question 5

Work out the following mentally.

80 + 11 =
91
EDDIE SAYS
80 + 10 = 90 90 + 1 = 91
• Question 6

Work out the following mentally.

31 − 18 =
13
EDDIE SAYS
30 - 10 = 20 8 - 1 = 7 20 - 7 = 13
• Question 7

Work out the following mentally.

75 − 45 =
30
EDDIE SAYS
70 - 40 = 30 5 - 5 = 0 30 - 0 = 30
• Question 8

Work out the following mentally.

293 − 67 =
226
EDDIE SAYS
90 - 60 = 30 7 - 3 = 4 30 - 4 = 26 200 + 26 = 226
• Question 9

Work out the following mentally.

61 − 36 =
25
EDDIE SAYS
60 - 30 = 30 6 - 1 = 5 30 - 5 = 25
• Question 10

Work out the following mentally.

666 − 51 =
615
EDDIE SAYS
6 - 1 = 5 60 - 50 = 10 600 + 10 + 5 = 615
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