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L'addition par décomposition
Matériel didactique : Exercices au tableau et craie
Objectif opérationnel : Au terme de cette séquence didactique chacun des apprenants devra être capable d'additionner les nombres en décomposition.

Rappel

Dispose puis effectue ces exercices 

72 + 15 = 87

88 - 18 = 106

70 + 30 = 100

97 - 6 = 103

Rappel

Exercices des apprenants au tableau

72 + 15 =

88 - 18 = 

70 + 30 =

97 - 6 = 

Motivation 

Présentation d'un exercice au tableau 

24 + 5 = 29

Motivation 

Présentation d'un exercice au tableau 

24 + 5 =

De quelle opération s'agit-il ? Que venons-nous d'apprendre en numération ?

Il s'agit de l'addition .En numération nous venons d'apprendre la décomposition .

Annonce du sujet 

Qu'allons nous étudier aujourd'hui?

Annonce du sujet 

Aujourd'hui nous allons étudier l'addition par décomposition.

Lecture et calcul de l'addition par décomposition 

Lecture et calcul de l'addition par décomposition 

24 + 5 = 

18 + 31 = 

Observation : 

  • 24 + 5 = (20 + (4+5) ) = 20 + 9 = 29
  • 18 + 13 = (10+10) + (8+3) = 20 + 11 = 31

24 + 5 = 

18 + 31 = 

Observation : 

  • 24 + 5 = (20 + (4+5) ) = 20 + 9 = 29
  • 18 + 13 = (10+10) + (8+3) = 20 + 11 = 31

Les apprenants lisent les exercices au tableau et suivent attentivement le déroulement des opérations du maître 

Que venons-nous d'apprendre ?

Nous venons d'apprendre l'addition par décomposition 

Synthèse et validation 

Résolution au tableau et validation 

8.1.28PHP Version167msRequest Duration6MBMemory UsageGET lessons/{id}/{slug}Route
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    • Application (129ms)
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