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+Développer l'intelligence du calcul 20_10_21

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Programmation CM2 défis calculs 2021-09-20 Guylaine FREGUIS Bezons

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Programmation CM1 défis calculs 2021-09-20 Guylaine FREGUIS-Bezons

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Outil distributivité multiplication

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Those you share this with will see the current array and settings.

Make a new rectangle

Change the size of the rectangle by entering whole numbers (up to 50) in the boxes. Then press the MAKE button.

Add and move the sliders

Drag the slider handles from the left or top to divide the rectange into smaller parts. Include up to 4 sliders on each axis.

View partial products

Watch how the equation changes depending on the position of the sliders. Point at any region to see the corresponding piece of the equation.

Show or hide answers

Toggle these buttons to show or hide the results of the equation.

Partial Product Finder allows multiplication combinations to be represented as a rectangle, or array, with dimensions that match the combination. The sides of the rectangle can then be divided into parts to reveal partial products that make up the total product. This helps students develop the flexibility and conceptual understanding required to build fluency with basic facts and strategies for multiplication of larger numbers.

We Welcome Your Feedback

Help us guide the ongoing development of this app by sharing your reactions or suggestions.

Partial Product Finder is brought to you by The Math Learning Center, a nonprofit organization serving the education community since 1976. Visit us at www.mathlearningcenter.org, where you can learn more about our organization, the Bridges in Mathematics PK-5 curriculum we publish, and the many free math education resources we provide, including a robust suite of free virtual manipulatives for use online or as downloadable apps for a variety of operating systems, including Apple iOS and Google Chrome.

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Partial Product, by The Math Learning Center

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Partial Product Finder allows multiplication combinations to be represented as a rectangle, or array, with dimensions that match the combination.

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Outil ligne numérique

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Number Line helps students visualize number sequences and demonstrate strategies for counting, comparing, adding, subtracting, multiplying, and dividing.

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Le calcul instrumenté correspond ici à l'utilisation d'un petit tableau de nombres de 1 à 50.

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Compléments à 50 Support élève défi calcul

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Didier.

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Les élèves colorient les ronds en fonction du code couleur choisi.

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Une utilisation de Workspace pour réaliser une mise en commun projetable en séance N+1 (NB : il est possible de réaliser la même chose sur Activinspire).

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Une utilisation de Workspace pour réaliser une mise en commun projetable en séance N+1 (NB : il est possible de réaliser la même chose sur Activinspire).

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Automatismes et calcul mental à données aléatoires sous forme de diaporamas, réponses en ligne, feuilles d'exercices, cartes flash, dominos, duels en ligne... ( ancienne version) plus d'infos sur À propos

MathsMentales est un logiciel libre et gratuit sous licence Apache 2.0.

Contact : contact@mathsmentales.net pour signaler les problèmes, faire des suggestions...
Un bon CTRL + F5 peut aider lors d'un blocage, mais pas toujours !

Je collabore avec CoopMaths qui propose de nombreuses fiches d'exercices à données aléatoires ainsi que tout un tas d'outils pour l'individualisation des apprentissages.

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MathsMentales : Automatismes et calcul mental en mathématiques

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Mathsmentales est une webapplication qui facilite la mise en place de rituels de calcul mental avec un corrigé final. Les questions aléatoires portent sur de nombreux thèmes.

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Pour travailler sur les nombres décimaux

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Pour travailler sur les nombres décimaux

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Click on number line to zoom in, shift-click to zoom out.
Click at left or right to scroll.

Learn About Numbers

See that numbers behave the same, whether they are 1, 2, 3, or 10, 20, 30, or 0.01, 0.02, 0.03.

Learn about decimals:

Zoom in and look at: 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, ...

Then ask: what is 0.9 + 0.1 ?

Do the same after zooming in further:

What is 0.09 + 0.01?

What is 0.19 + 0.01?

What is 0.99 + 0.01?

You can see how decimal place values work and get a feel for "infinite" sub-divisibility (but this tool gets into trouble around 30 decimal places).

Using

Click on number line to zoom in, shift-click to zoom out. It will zoom from where you click.

Click at left or right to scroll.

Or you can use your keyboard's arrow keys.
Up/down to zoom, left/right to move.

Try this:

Use the "right" key, you will see the counting numbers whizz past.

Stop when you reach 100.

Go back to zero (press the reset button).

Zoom in to show 0.1, 0.2, 0.3, ...

Now try tracking right. The tenths whizz by.

How long does it take to reach 100 now?

Try zooming in to 0.01, 0.02, 0.03, ...

How long does it take to track across to 100 now (if you have the patience!) ?

How much better to realise that you can zoom out a level and go up in tens. Then you can zoom in so that you are at 100.00

Test yourself. Start at 0. Use the zoom and left/right to find these numbers:

Race To 100.00357

Challenge your friends! Start at 0 (press the '0' button), then see how fast you can get to 100.00357 (you must see that number on the screen).

Least Moves

How many moves does it take to find a number?

Not against the clock but by counting the number of moves you make.

Use just the arrow keys and try to find the least number of key-presses to reach a number

(Note: A count of your keystrokes is in the bottom corner.)

How many moves does it take you to reach:

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Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

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Cette information a été mise à jour pour la version 1.1.3, publié en janvier 2017.
Description
Concepts mathématiques
Exemples: Réglettes-nombres naturels
Exemples: Réglettes
Exemples: Réglettes-nombres décimaux
Exemples de questions
Raisonnement et épreuve
Fonctionnalités des outils
Raccourcis clav…

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Abaque virtuel permettant de travailler la numération à l'école primaire.

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A faire en 1 minute 30 et inscrire le temps restant si les calculs sont terminés avant (chronomètre sur classroomscreen).

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6 calculs au choix dans les deux niveaux

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6 calculs au choix dans les deux niveaux

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Graphique à remplir chaque semaine pour les résultats

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Graphique à remplir chaque semaine pour les résultats

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Réflexions communes sur la mise en commun