Exercices sur l’addition de fractions - 2
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7/31/2019 Exercices sur laddition de fractions - 2
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7/31/2019 Exercices sur laddition de fractions - 2
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Correction
1) 8/40 + 3/10 =
8/40 + (3*4)/(10*4)
8/40 + 12/40
20/40
Simplifi (20/20) / (40/20)
1/2
2) 3/4 + 2/5 + 7/20 =
(3*5)/(4*5) + (2*4)/(5*4) + 7/20
15/20 + 8/20 + 7/2
30/20
(30/10) / (20/10)
3/2
3) 11/100 + 9/100 =
20/100
(20/20) / (100/20)
1/5
4) 1/6 + 1/6 =
2/6
(2/2) / (6/2)
1/3
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7/31/2019 Exercices sur laddition de fractions - 2
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5) 11/21 + 7/21 =
18/21
(18/3) / (21/3)
6/7
6) 7/20 + 23/80 =
(7*4) / (20*4) + 23/80
28/80 + 23/80
51/80
7) 4/9 + 13/54 =
(4*6) / (9*6) + 13/54
24/54 + 13/54
37/54
8) 7/18 + 17/36 =
(7*2) / (18*2) + 17/36
14/36 + 17/36
31/36
9) 17/36 + 1/6 =
17/36 + (1*6) / (6*6)
17/36 + 6/36
23/36
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7/31/2019 Exercices sur laddition de fractions - 2
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10) 8/15 + 3/45 =
(8*3) / 15*3) + 3/45
24/45 + 3/45
27/45
(27/9) / (45/9)
3/5
