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2 + 4 + 3 +9 = 18 Il y a 18 cubes. 2

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DEFI MATH 2017/2018

Equipe coordinatrice CPC Marseille 04, 06, 09, Allauch-Plan de Cuques, Aix Ouest, Aix Sud

DEFI N°3 – CP Solutions

Problème n°1 LES CUBES

2 + 4 + 3 +9 = 18

Il y a 18 cubes.

Problème n°2

LE NOMBRE MYSTERE

• Mon nombre est plus grand que 30 et plus petit que 50 : il est donc entre 30 et 50, je barre les nombres plus petis que 30 et ceux plus grands que 50.

• Mon nombre n’a pas de 4 : je barre tous les nombres qui ont le chiffre 4

• Si j’additionne les chiffres de mon nombre je trouve 11 : je calcule la somme des chiffres des nombres restants. 3 + 8 = 11 c’est donc 38

2

3 + 1 caché = 4

3

1+2+3+1+2 cachés= 9

1

2

3

1 + 2 cachés

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DEFI MATH 2017/2018

Equipe coordinatrice CPC Marseille 04, 06, 09, Allauch-Plan de Cuques, Aix Ouest, Aix Sud

Problème n°3

LA CHASSE AU TRESOR

Conseil : utiliser le coloriage des cases plutôt que les flèches (qui peuvent être source d’erreur) Par exemple : dans le déplacement (D ; 6) vers (E ; 6), certains risquent de

commencer les 4 cases en (D ; 5) à cause de l’orientation de la flèche précédente

Le trésor est dans la case ( B ; 2 )

Références

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