1) Efetue as seguintes multiplicações:
a) (+7) . (−5) =
b) (−9) . (−8) =
c) (+10) . (+3) =
d) (+9) . (−11) =
e) (−7) . (+6) =
f) (−10) . (+11) =
g) (−15) . (−6) =

2) Efetue as seguintes divisões:
a) (−15) : (+5) =
b) (+32) : (+4) =
c) (−20) : (−20) =
d) (+18) : (−2) =
e) (−75) : (−5) =
f) (+84) : (+21) =
g) (−96) : (+6) =
h) (+200) : (−25) =