Question

12-7+3 ; 4 +13 -21; -8 +8 +1; -7 +6 +9; -5 -3 -4 -1; +10 -43 -17

Answer 1

a)

= 12 - 7 + 3

= 5 + 3 

= 8
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)

= 4 + 13 - 21;

= 17 - 21

= - 4

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)

= - 8 + 8 + 1

= 0 + 1

= 1 

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
d)

= - 7 + 6 + 9 

= - 1 + 9

= 8

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
e)

= - 5 - 3 - 4  - 1 

= - 8 - 5

= - 13
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
f)

= + 10 - 43 - 17

= 10 - 60

= - 50