Activité 4 – Différence de deux nombres entiers

c) Ecris la différence sans parenthèses, puis calcule.

(+ 5) – (– 4) =
5 + 4 =
9
42 – (– 4) =
42 + 4 =
46
(– 9) – (– 5) =
– 9 + 5 =
– 4
– 21 – (+ 14) =
– 21 – 14 =
– 35
(– 17) – (+ 2) =
– 17 – 2 =
– 19
– 8 – (– 5) =
– 8 + 5 =
– 3
(+ 2) – (– 7) =
2 + 7 =
9
(– 12) – (– 7) =
– 12 + 7 =
– 5
(– 17) – (– 9) =
– 17 + 9 =
– 8
– 21 – (– 30) =
– 21 + 30 =
9