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Feuille d’exercices – Calculs sur les fractions – 5ème
Exercice I : Simplifier le plus possible
28
12=
34
22=
25
45=
35
63=
24
20=
38
42=
15
12=
25
100=
55
33=
26
39=
60
44=
200
70=
18
54=
56
40=
27
15=
31
93=
57
19=
46
74=
91
52=
95
76=
Exercice II : Calculer Exercice III : Calculer
2 9
7 7+ =
2 8
9 9+ =
18 11
5 5− =
12 1
19 19− =
5 9
16 4+ =
7 5
32 8+ =
38 11
5 25− =
2 7
3 18− =
12 11
5 20+ =
13 3
64 8+ =
47 5
54 9− =
6 13
7 21− =
17 5
36 9+ =
9 2
40 5+ =
37 2
45 5− =
53 6
42 7− =
Exercice IV : Calculer et simplifier (il faut souvent mieux simplifier AVANT de calculer, quand c’est possible)
2 9
7 5× =
12 4
9 7× =
1 25
10 3× =
16 3
19 8× =
24 5
11 6× =
13 6
8 26× =
36 2
5 18× =
52 4
4 48× =
2 10 9
5 6 7× × =
1 3 5 7
3 5 7 9× × × =
4 6
15 8× =
11 25 8 3
12 14 22 5× × × =
Exercice V : Calculer, en suivant les priorités
1 5 1
2 3 4+ × =
6 14 3
7 24 2× + =
2 3 3 1
5 10 4 5+ − × =
3 5 3 1
7 14 11 22 + × + =
13 5 3 1
4 8 2 8 − + × =