Activité 3 – Somme de deux nombres entiers (applications)

c) Ecris la somme sans parenthèses, puis effectue.

(– 7) + (+ 4) =
– 7 + 4 = – 3
(+ 6) + (– 7) =
6 – 7 = – 1
(+ 21) + (– 10) =
21 – 10 = 11
(+ 5) + (– 17) =
5 – 17 = – 12
(+ 17) + (+ 14) =
17 + 14 = 31
(– 24) + (– 15) =
– 24 – 15 = – 39
(– 21) + (– 33) =
– 21 – 33 = – 54
(– 17) + (+ 21) =
– 17 + 21 = 4
(– 11) + (– 13) =
– 11 – 13 = – 24
(+ 17) + (+ 21) =
17 + 21 = 38