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a) ( – 8) + ( – 12) = -20

g) [( – 3) + ( + 8)] + ( – 7) =

8-(3+7)
8-10 = -2

b) ( + 15) + ( +12) = 27

h) [ (+ 10) + ( –7) ] + ( – 8) =

10-7-8 = 10-(7+8)
10-15
10-15 = -5

c) ( – 18) + ( + 13) =-5

i) [( + 18) + ( –13) ] + ( – 16) = 18-13-16 = 18-(13+16):
18-29=-11

d) ( + 57) + ( – 32) =25

j) [( – 20) + ( +8 )] + (+ 13) =

-20+8+13
21-20=1

e) ( – 59) + ( + 61) =3

k) [(– 31) +( + 21)] + ( + 15) =
36-31 = 5

f) (