While adding or subtracting integers, we follow three rules

(1)  + & −  becomes −

  2 + (−3) = 2 − 3

  −4 − (+8) = −4 − 8

 

(2)  + & + becomes +

  5 + (+1) = 5 + 1

  −7 + (+3) = −7 + 3

 

(3)  − & −  becomes +

  4 − (−6) = 4 + 6

  − 9 − (−2) = −9 + 2

 

Let’s look at some example

 

(1)  2 + (−3)

    = 2

Taking − common

    = −(−2 + 3) 

    = −(3 − 2)

    = −1

 

(2) −4 − (+8)

     = −4 − 8

Taking − common

     = −(4 + 8)

     = −12

 

(3)  5 + (+1)

     = 5 + 1

     = 6

 

(4)  −7 + (+3)

    = −7 + 3

Taking − common

    = −(7 − 3)

    = − 4

 

(5)  4 − (−6)

    = 4 + 6

    = 10 

 

(6) −9 − (−2)

    =  −9 + 2

Taking − common

    = −(9 − 2)

    = −7

  1. Chapter 6 Class 6 Integers
  2. Concept wise
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.