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Entraînement 1 : complète le tableau ci-dessous sachant que l’extrémité de chaque flèche indique la somme de la ligne ou de la colonne correspondante.

2 3

1 3

4 3

10

3 →

5 3

2 3

1 3

4

3 →

↓ ↓ ↓ ↓

Entraînement 2 : complète le tableau ci-dessous sachant que l’extrémité de chaque flèche indique la somme de la ligne ou de la colonne correspondante.

24 5

2 5

0 5

3

5 → 10

5 1

5 →

↓ ↓ ↓ ↓

← 4 5

7 5

Entraînement 3 : complète les pyramides proposées :

La cellule du dessus est la somme des deux cellules sur lesquelles elle est posée

Fiche …… Connaissance des nombres Addition de fractions Fr17

Pyramide n°1 Dénominateur commun : 7

1 7

3 7

2 7

5 7

Pyramide n°3 Dénominateur commun : 11

9 11 5

11 3 11

1 11 Pyramide n°2

Dénominateur commun : 12

7 12 5

12

1

12

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