1) Escreva na forma simplificada e depois calcule as adições:
a) (+20) + (-18)=
b) (-30) + (+21)=
c) (-81) + (-17)=
d) (+37) + (+52)=
e) (-15) + (+22) + (-6)=
f) (+27) + (+13) + (-28)=
g) (-50) + (-30) + ( -12)=
h) (+32) + (-68) + (-22) + (-27)=

2) Calcule
a) +7+17=
b) -8-8=
c) -9 + 14=
d) -40-11=
e) 31+14=
f) -17+14+3=
g) 27-16-10=
h) -75+70+50=

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