Next
Tristan

Tristan

Posted on 04/13/2007

Video filmed on the November 16, 2006

See also...

Keywords

calcul •
mathématiques •

Authorizations, license

Visible by: Everyone
All rights reserved
1 013 visits

cours de mathématiques

U-schi, Marie-claude Guerout, Manu, Thomas Peiniau have particularly liked this photo

7 comments - The last ones
Lea d'ipernity
Lea d'ipernity
génial!
6 years ago.
Amandine // Mata Har… has replied to Lea d'ipernity
J'avais testé, ça marche même avec des nombres plus complexes, il faut juste s'armer d'un peu de patience!
6 years ago.
athebird
athebird
En voilà un truc qui pourrait me servir :)
Merci Tristan !
6 years ago.
###
###
Vraiment génial ça !
Merci de le partager :)
6 years ago.
Thomas Peiniau
Thomas Peiniau
Si j'avais su cela au CM2... Et as-tu une explication à cette propriété ?
5 years ago.
assbach
assbach
WTF??? is that real or just a coincidence? or something? what's the rule?
5 years ago.
Tristan has replied to assbach
Easy... :)
This is nothing more than the graphical representation of what we are usually doing with digits to compute a multiplication.

For instance, if you want to compute 21 * 13 by hand, you will need to write:

. 2 1
. 1 3
_____
. 6 3 <-- here you find again the groups of lines intersections
2 1 .
_____
2 7 3
5 years ago.

Sign-in to post a comment.