This problem helps students practice adding three numbers whose sum are 20 or less.

Un site de France pour l'enseignement des mathématiques, avec des leçons (cours), exercices (avec correction), et exercices répétitifs de calcul mental. Plusieurs fichiers sont disponibles aussi en format PDF.

« Tout élève qui souhaite s'entraîner peut trouver dans ce site des exercices corrigés correspondants à sa classe.
Les niveaux 6e, 5e, 4e et 3e couvrent l'ensemble du programme. Il n'y a ni compétition ni enjeu. Une solution est disponible à tout moment. Ce n'est le plus souvent qu'une solution parmi d'autres.

*Sauf indication contraire, il faut donner la réponse des exercices interactifs, s'il s'agit d'un nombre décimal, avec une virgule. Dans les exercices répétitifs, les nombres sont générés par l'ordinateur, il faut écrire les décimaux avec un point à la place de la virgule.*

Les exercices et les résumés de cours sont signalés de la façon suivante :

-Un résumé du cours : En géométrie, les images mobiles ou les animations flash permettent de visualiser les notions abordées.
-Exercice corrigé : Des exercices pour s'entraîner, avec les corrections disponibles à tout moment. Mais d'abord il faut chercher ...
-Exercice interactif corrigé: On peut répondre directement sur l'ordinateur, mais une feuille de papier et un crayon sont le plus souvent nécessaires pour faire l'exercice entièrement.
-Exercice répétitif : calcul mental : Entraînement au calcul mental sur les techniques basiques à acquérir en mathématiques.

Attention : il faut toujours commencer l'exercice par "recommencer' ou "nouveau calcul" , l'exercice affiché à l'écran n'est qu'un exemple. Il n'est pas à tester ! »

-AAA Math features a comprehensive set of thousands of interactive arithmetic lessons.

-There is no cost or registration required to practice your math on the AAAMath.com web site.

-Unlimited practice is available on each topic which allows thorough mastery of the concepts.

-A wide range of lessons (Kindergarten through Eighth grade level) enables learning or review to occur at each individual's current level.

-Immediate feedback prevents practicing and learning incorrect methods, which is a common result of traditional homework and worksheets. Practice can continue as long as desired in a non-threatening format which helps build self-esteem and confidence.

-Please feel free to try the lessons by clicking on one of the grades at the top or a topic area on the left side of the page.

-Remember to add the site to your Favorite Places and please tell others about the site. It is an excellent way to learn or review math.

This short video and interactive assessment activity is designed to teach second graders an overview of addition (sums to 100).

This is a video overview of addition word problems (to sums of 100) for first graders.

This short video and interactive assessment activity is designed to teach third graders an overview of mixed operations.

This short video and interactive assessment activity is designed to teach second graders an overview of mixed operations (numbers to 1,000).

This short video and interactive assessment activity is designed to teach second graders about mixed operations: addition and subtraction i - word problems.

This short video and interactive assessment activity is designed to teach second graders about adding and subtracting (numbers up to 20) - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about adding and subtracting fractions - word problems.

This short video and interactive assessment activity is designed to teach fourth graders about adding 3 numbers - word problems.

This is an interactive assessment and video designed to teach Adding and Subtracting (Numbers up to 20) - Word Problems to first graders.

This short video and interactive assessment activity is designed to teach fourth graders about adding and subtracting terms (numbers to 100).

This addition card mat is meant to be set up as a center to use during your addition unit.
Students will flip over 2 cards and place them in the card spots. They will then use a dry erase marker to write the full addition sentence.

You will need to print the mat and laminate in order to use with dry erase. Alternatively, you could place sheet in a dry erase sleeve.

This short video and interactive assessment activity is designed to teach fourth graders about addition: completing the addition sentence.

This Math Center is great for using in Rotation Math in Early Elementary. Students can work independently and are engaged at this addition center.

The purpose of this task is to study some patterns in a small addition table. Each pattern identified persists for a larger table and if more time is available for this activity students should be encouraged to explore these patterns in larger tables.

This document contains 6 posters full of good addition strategies to use with students.

This course features a video review of addition up to the sum of ten for first graders.

This short video and interactive assessment activity is designed to teach second graders an overview of addition (sums to 10).