Question

a)     45 – 5. (12 + 9)

b)    24. (16 – 5) – 16. (24 - 5)

c)     29. (19 – 13) – 19. (29 – 13)

Answer 1

a, 45 - 5. ( 12 + 9 ) = 45 - 5 . 21 = 45 - 105 = - 60

b, 24. ( 16 - 5 ) - 16 ( 24 - 5 ) = 24 . 11 - 16 . 19 = 264 - 304 = - 40

c, 29 . ( 19 - 13 ) - 19 . ( 29 -13 ) = 29 . 6 - 19 . 16 = 174 - 304 = - 130

Answer 2

a) 45 - 5 ( 12 + 9 )

= 45 - 5 . 21

= 45 - 105

= -60

b) 24 . ( 16 - 5 ) - 16 . ( 24 - 5 ) 

=  ( 24 . 16 ) - ( 24 . 5 ) - ( 16 . 24 ) - ( 16 . 5 )

= [ ( 24 . 16 ) - ( 16 . 24 ) ] - 5(24 - 16)

= 0 - 40

= -40

c) 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )

= ( 29 . 19 ) - ( 29 . 13 ) - ( 19 . 29 ) - ( 19 . 13 )

= [ ( 29 . 19 ) - ( 19 . 29 ) ] - 13(29 - 19)

= 0 - 130

= -130

Answer 3

a)45-5×(12+9)=45-(5×12+5×9)

                         =45-(60+45)

                         =45-60-45

                         =(45-45)-60

                         =-60

b)24×(16-5)-16×(24-5)

=(24×16-24×5)-(16×24-16×5)

=24×16-24×5-16×24+16×5

=(24×16-16×24)-(24×5-16×5)

=0-40

=-40

c)29×(19-13)-19 (29-13)

=29×19-29×13-19×29+19×13

=(29×19-19×29)-(29×13-19×13)

=0-130

=-130

Answer 4

a45 - 5.(12 + 9)

=45 - 5. 21

=45 - 105

=-60

b 24.(16-5)-16.(24-5)

=24.11-16.19

=264-304

=(-40)

c29.(19-13)-19.(29-13)

=29.6-19.16

=174-304

=(-130)

Answer 5

a) 45 - 5 . ( 12 + 9 )

= 45 - 5 . 21

= 45 - 105

= -60

b) 24 . ( 16 - 5 ) - 16 . ( 24 - 5 ) 

= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5

= ( 24 . 16 - 16 . 24 ) - ( 16 . 5 - 24 . 5 )

= 0 - [ 5 . ( 16 - 24 ) ]

= 0 - 5 . ( - 8 )

= 0 - ( - 40 )

= 40

c) 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )

= 29 . 19 - 29 . 13 - 19 . 29 - 19 . 13

= ( 29 . 19 - 19 . 29 ) - ( 19 . 13 - 29 . 13 )

= 0 - [ 13 . ( 19 - 29 ) ]

= 0 - 13. ( - 10 )

= 0 - ( - 130 )

= 130