Compositon colorée (investigation collective)

Avec ce fichier, les élèves doivent deviner le nombre de boules de chaque couleur contenu dans cette urne? Bien sûr on peut changer le nombre de chacune en cachette. Avec un TBI projetant ce fichier, chaque groupe peut venir simuler ses essais., devant la classe et expliquer sa démarche pour trouver le décompte estimé par leurs calculs. Ensuite la discussion peut s'engager sur le nombre de tirages possibles pour la fiabilité des résultats. (D'ailleurs un point intéressant: si le nombre total  de boules est de 40, la majorité des groupes d'élèves proposent 40 tirages, pour 50 boules , 50 tirages, etc....... )

Cliquez sur l'image pour lancer le fichier 

A essayer dans votre classe avec un système de retroprojection.

 

 

With this file, students must guess the number of balls of each color contained in that box? Of course you can change the number of each secretly. With TBI for projecting this file, each group can simulate future essays., To the class and explain his approach to find the count estimated by calculations. Then the discussion can embark on the number of  possible tests reliability of the results. (Besides an interesting point: if the total number of balls is 40, the majority of student groups offering 40 tests for 50 balls, 50 tests, etc .......)

Try in your class with a system retroprojection.

Filling various geometric forms

An useful file in Geogebra 4  for visualizing the speed of filling of various geometric containers

Click on the picture to launch the file

 

 

To obtain this file, you must subscribe to this blog

Rythmic box ( playsound with Geogebra)

Adjust the sound of your card and dance with Geogebra

 

Click on the picture to launch the file

 

Soon available in Html5 if it is possible, for the moment tis file can be doownload here:  http://dmentrard.free.fr/GEOGEBRA/

Introduction to equations

You must answer in the boxes and then request the correction.
Exercise is automatically corrected with "B" correct or "F" wrong.
Press next to a new series.

                                    

                                         Click on the picture to launch the html file (ggb file inside)

 

 

This file can be download on http://dmentrard.free.fr/GEOGEBRA/    ( scripts in javascriopt on html)

Waterpipes challenge

Solve a connection problem and graph

Interactives fractions

Input your answer in the box( script in html)

                       

                                                             Click on the picture to launch the ggb file

Vertices, strings and diagonales

 

Comment trouver le nombre de ficelles utilisables pour suivre les côtés et les diagonales d'un polygone régulier? (How to find the number of strings used to monitor the sides and diagonals of a regular polygon?)

                            

                                     Click on the picture to launch the ggb file.

Dice Challenge

Sum of two opposite faces  of  a dice is 7. One  of this patterns is false. Which one?

You can move, open or close all the patterns in this file

                        

                       Click on the picture to launch the ggb file.