Question

Calcule as subtrações:

a) (+ 18) – (+ 7) =

b) (+ 56) – (– 10) =

c) (– 13) – (+ 12) =

d) 0 – (– 45) =

e) (– 79) – (+ 99) =

f) (– 25) – (– 48) =

g) (– 59) – (+ 33) =

h) (+ 90) – (– 1) =

Answer 1

a) (+ 18) – (+ 7) = 11
b) (+ 56) – (– 10) = 66
c) (– 13) – (+ 12) = -25
d) 0 – (– 45) = 45
e) (– 79) – (+ 99) = -178
f) (– 25) – (– 48) = 23
g) (– 59) – (+ 33) = -92
h) (+ 90) – (– 1) = 91

Answer 2

Boa noite.

a) (+18)–(+7) = 9 
b) (+56)–(–10) = 66 
c) (–13)–(+12) = -25
d) 0–(–45) = 45
e) (–79)–(+99) = -178
f) (–25)–(–48) = 23
g) (–59)–(+33) = -92
h) (+90)–(–1) = 91


a) (+18)–(+7) =

18-7 = 9

b) (+56)–(–10) =

56+10 = 66

c) (–13)–(+12) =

-13-12 = -25

d) 0–(–45) =

0+45 = 45

e) (–79)–(+99) =

-79-99 = -178

f) (–25)–(–48) =

-25+48 = 23

g) (–59)–(+33) =

-59-33 = -92

h) (+90)–(–1) =

90+1 = 91

Regras dos sinais: 

+ com + = +
- com - = +
- com + = -
+ com - = -

Bons estudos! :-)