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  1. Maths
  2. Year 8
  3. Addition and Subtraction
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Mental Addition and Subtraction of Positive and Negative Numbers

In this worksheet, students add and subtract positive and negative numbers in their heads.

'Mental Addition and Subtraction of Positive and Negative Numbers' worksheet

Key stage:  KS 3

Curriculum topic:  Number

Curriculum subtopic:  Use Four Operations for All Numbers

Difficulty level:  

Preview

Worksheet Overview

QUESTION 1 of 10

The calculations in this worksheet must be done in your head before writing down the answers.

 

Examples

(-9) - (-8) = (-9) + 8 = 8 - 9 = -1

82 + (-6) = 82 - 6 = 76

(-5) - 5 = -10

In your head, work out:

 

(-89) - (-15) = _______

In your head, work out:

 

(-80) + (-43) = _______

In your head, work out:

 

(-7) - (-88) = _______

In your head, work out:

 

(-80) - (-32) = _______

In your head, work out:

 

(-60) + (-29) = _______

In your head, work out:

 

(-6) - (-14) = _______

In your head, work out:

 

(-91) - (-29) = _______

In your head, work out:

 

(-18) + (-84) = _______

In your head, work out:

 

(-87) + (-15) = _______

In your head, work out:

 

(-9) + (-71) = _______

  • ANSWERS
  • Question 1

In your head, work out:

 

(-89) - (-15) = _______

CORRECT ANSWER
-74
  • ANSWERS
  • Question 2

In your head, work out:

 

(-80) + (-43) = _______

CORRECT ANSWER
-123
  • ANSWERS
  • Question 3

In your head, work out:

 

(-7) - (-88) = _______

CORRECT ANSWER
81
  • ANSWERS
  • Question 4

In your head, work out:

 

(-80) - (-32) = _______

CORRECT ANSWER
-48
  • ANSWERS
  • Question 5

In your head, work out:

 

(-60) + (-29) = _______

CORRECT ANSWER
-89
  • ANSWERS
  • Question 6

In your head, work out:

 

(-6) - (-14) = _______

CORRECT ANSWER
8
  • ANSWERS
  • Question 7

In your head, work out:

 

(-91) - (-29) = _______

CORRECT ANSWER
-62
  • ANSWERS
  • Question 8

In your head, work out:

 

(-18) + (-84) = _______

CORRECT ANSWER
-102
  • ANSWERS
  • Question 9

In your head, work out:

 

(-87) + (-15) = _______

CORRECT ANSWER
-102
  • ANSWERS
  • Question 10

In your head, work out:

 

(-9) + (-71) = _______

CORRECT ANSWER
-80
---- OR ----

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