Les nombres relatifs - 5e

Représentations des relatifs et des décimaux

Exercice 1 : Placer un point sur un axe de graduation 0,5 qui ne démarre pas à 0 (décimaux)

Placer le point qui a pour abscisse \(4,2\)

Exercice 2 : Placer un point sur un axe de graduation 10 qui démarre à 0 (entier)

Placer le point qui a pour abscisse \(8\)

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Exercice 3 : Placement de points et calcul de distance sur une droite graduée

Placer sur la droite graduée les points d'abscisses respectives A(-3), B(2,5), C(8,5), D(2)

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Calculer les distances suivantes:
AB;AC;AD;BC;CD
On donnera la liste séparée par des points-virgules, par exemple: 1;4;2.

Exercice 4 : Trouver l'abscisse d'un point sur un axe qui ne démarre pas à 0 de graduation au centième (nombres décimaux positifs)

Quelle est l'abscisse du point B ?

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(On donnera la réponse sous la forme d'un nombre décimal)

Exercice 5 : Se repérer sur une droite graduée non donnée

Sur une droite graduée d'origine O, donner toutes les abscisses possibles des points suivants :
(On donnera la liste des abscisses séparée par des points-virgules)

Aide : Penser à tracer une droite graduée.

A, situé à 3 unités de O

B, situé à 3 unités du point C d'abscisse 7.

D, situé à 3 unités du point E d'abscisse -4.

Revenir au choix du niveau