Check sibling questions

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 − 3

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

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.