#soustraction

So I’m prepping to tutor French-speaking children in elementary math, and I came across this. 

This is not how I learned to do subtraction. However, I learned elementary-level math a very long time ago, so I don’t know if this is what is called “new math” in the U.S. or just French (/European)-style subtraction. 

I welcome your comments.

UPDATE: For anyone who did learn subtraction as in the first image and is wondering how else you would do it, I have included an annotated second image to show how I was taught to do subtraction in the U.S.

Les deux sans doute…

Tell me, in the same way that by mixing different colors we get others, sometimes more primary in the opposite sense of the preceding (whether from subtractive to additive or the other way around), what does the sum of all intelligences give, something more primary or the other way around ?

Atelier de calcul – CP

En m’inspirant de ce qu’on trouve sur internet, en parcourant les créations d’autres collègues sur les réseaux sociaux et en fonction de la façon dont je souhaite travailler avec mes élèves, j’ai créé mon propre atelier de calcul pour mes élèves de CP. Rien de révolutionnaire, j’ai appelé ça “les cartaduos” (associer deux cartes) : il faut mettre côte à côte la carte calcul (l’épée) et la carte…