Faça os seguintes cálculos (atenção com os sinais):

a) [m] 12 + 2 [/m]

b) [m] -12 -2 [/m]

c) [m] 12 -2 [/m]

d) [m] -12 +2 [/m]

e) [m] 2 -12 [/m]

f) [m] -2 +12 [/m]

Calcule:

a) [m] 100 -78 [/m]

b) [m] -52 -67 [/m]

c) [m] 6 -108 [/m]

d) [m] -456 -654 [/m]

e) [m] -600 +800 [/m]

f) [m] -1025 + 625 [/m]

g) [m] 1050 -50 [/m]

h) [m] -36 -75 [/m]

i) [m] 1 -200 [/m]

j) [m] -7.800 -6.612 [/m]

k) [m] -8.520 +900 [/m]

l) [m] -632 + 635 [/m]

m) [m] – 985 + 976 [/m]

Efetue as multiplicações:

a) [m] 5 \cdot 7 [/m]
b) [m] -5 \cdot (-7) [/m]
c) [m] -5 \cdot 7 [/m]
d) [m] 5 \cdot (-7) [/m]

Calcule as divisões :

a) [m] 81 \div (-9) [/m]

b) [m] -200 \div (-100) [/m]

c) [m] -512 \div 4 [/m]

d) [m] -99 \div (-9) [/m]

e) [m] 150 \div (-5) [/m]

f) [m] (-240) \div (-8) [/m]

g) [m] 1088 \div (-2) [/m]

h) [m] -6981 \div (-3) [/m]

i) [m] 169 \div 13 [/m]

j) [m] -196 \div (-14) [/m]

k) [m] 2535 \div (-5) [/m]

l) [m] -5000 \div 100 [/m]

m) [m] -651 \div (-3) [/m]