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La soustraction sans et avec emprunt
Domaine Science Sous domaine Mathématiques
Section Primaire Option Primaire
Discipline Opérations Classe 2ème
Matériel didactique Tableau noir, craies blanches Auteur SCHOOLAP.COM
Objectif opérationnel A l'issue de la leçon, l'élève sera capable de résoudre la soustraction des nombres entiers sans ou avec emprunt.
Réference Pratique de Math 2 page 164 - 167
Activité initiale

Rappel

Dispose et effectue :

1) 76 + 24 =

2) 38 + 21 =

3) 19 + 48 =

Rappel

Je dispose puis j'effectue :

                                 

Motivation

  • 37 - 24 =
  • 90 - 52 =

De quelle opération s'agit-il ?

Motivation

  • 37 - 24 =
  • 90 - 52 =

Il s'agit de la soustraction des nombres entiers.

Annonce du sujet

Quelle leçon allons-nous voir aujourd'hui ?

Annonce du sujet

Nous allons voir la soustraction des nombres entiers sans ou avec emprunt.

Activité principale

Présentation des exercices :

1) 37 - 24 =

2) 90 - 52 =

                  

Observation des élèves :

                 

Le maître ayant fait le modèle, il laisse l'essai aux élèves.

Les élèves font l'essai avec :

                        

Synthèse

Comment procède t-on à la soustraction du 2ème exemple.

On a procédé à l'emprunt d'une dizaine car 0 - 7 est impossible.

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