Question

a) - 153 + ( 153 - 27 ) ; b) - 21 - [( - 21 + 45 ) - 30 ] ; c) - 85 + 23 - 123 + 85

Answer 1

- 153 + ( 153 - 27 )

=-153+153-27

=0-27

=-27

 

- 21 - [( - 21 + 45 )

=-21+21-45

=0-45

=-45

 

- 85 + 23 - 123 + 85

=(-85+85)+(23-123)

=0-100

=-100

Answer 2

- 153 + ( 153 - 27 )

=-153+153-27

=0-27

=-27

 

- 21 - [( - 21 + 45 )

=-21+21-45

=0-45

=-45

 

- 85 + 23 - 123 + 85

=(-85+85)+(23-123)

=0-100

=-100