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Centaines, dizaines, unités

S1 E25
·
2018

Dans cette vidéo, je propose de revenir sur les centaines en s'entraînant à les lire et à les écrire. Tout d'abord, je rappelle ce que sont les unités et les dizaines. Ensuite, je propose d'illustrer une centaine par un bloc rouge de 10 dizaines afin de se rendre compte des quantités et d'éviter les confusions. Je présente également les nombres avec des colonnes (U, D, C) pour mieux repérer les chiffres de chaque catégorie. Pour finir, les exercices permettent de s'habituer à lire des nombres supérieurs à 100 et à les écrire à travers une dictée. La décomposition ainsi que la comparaison nécessitent des vidéos dédiées.

Levels:
Élémentaire 1re année 2e année 3e année
Subjects:
Mathématiques Nombres
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E48 : Les maisons d'additions : mémoriser les calculs

4 min 16 s
After understanding the meaning of addition, children begin to memorize certain calculations. This video is a fun way to review all the additions up to 10. Under the roof of each house, I put circles like in the Singapore method. This way, children realize that a quantity contains several equations and they can be added together to…
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E49 : Les multiplications posées à un chiffre

7 min 13 s
This video corresponds to the following mathematical skill: 'To know and implement an algorithm of calculation posed to carry out a multiplication'. It aims at mastering a technique to find the answer of a multiplication. Through animations, I tried to explain the process so that it can be reproduced.
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E50 : Les nombres de 69 à 99

8 min 44 s
After having well memorized the sequence of numbers up to 69, I propose this video to understand the functioning of the numbers from 69 to 99. It is a question of memorizing the names of the numbers and also to understand why 70 is called seventy and 90, ninety. To do this, I suggest using additions such as 60+14=74 in order to…
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E51 : Les nombres jusqu'à 5

7 min 44 s
This video deals with numbers and quantities up to 5. The objective is to quickly recognize the writing of numbers and their different representations (fingers, dice, tokens). Students start these exercises by counting one by one. With practice, they will be able to recognize quantities directly without going through the counting…
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E52 : Les solides

6 min 48 s
In this episode, Master Lucas presents the solids. He also emphasizes their characteristics: vertices, edges and faces.
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E53 : Les unités et les dizaines

6 min 52 s
All mathematical concepts become simpler when the tens and units are mastered. Comparing numbers, ordering, adding, subtracting, etc., all rely on this knowledge. In this video I have represented the units by blue cubes and the tens by green bars. The children are led to start from the cubes to find the numbers and vice versa.
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E54 : Lire l'heure

26 min 46 s
After posting five videos on telling time, I wanted to put them all together in one video for students who want to review everything. It is important to know that learning to tell time takes place over several years. So I don't recommend starting from scratch and seeing everything at once. It is better to be progressive in…
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E55 : Lire les heures : moins 10, moins le quart

5 min 51 s
We are coming up on the part of reading the time and the least obvious. Thus, it is better to master the other skills before approaching this video. This means reading the minutes before the next hour: minus twenty-five, minus twenty, etc. Managing multiple pieces of information is an obstacle for many students: they have to locate…
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E56 : Lire les heures de l'après midi

6 min 20 s
After learning how to read the full hours, this video discusses the afternoon hours. I explain that the little hour hand makes two turns in a day, so I show a dial with the hours from 13 to 24. Different exercises allow you to gradually associate the morning and afternoon hours.
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E57 : Mathématique - Lire les minutes

5 min 48 s
After learning to read the full hours and afternoon. This video aims to learn how to read the minutes. I explain that an hour is composed of 60 minutes that we indicate by noting the numbers from 5 to 5. The big hand shows the minutes when the small one indicates the hours. To read the time, we start with the hours, then the minutes…
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E58 : Lire les secondes

5 min 9 s
We meet again for a new video on reading the time with the reading of the seconds. After having mastered the reading of full hours and minutes, the students discover the seconds. They learn that one minute contains 60 seconds and that the seconds hand must therefore make a complete turn to make one minute. The lines used to read the…
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E59 : Mesurer avec une règle (cm, mm)

3 min 27 s
This video is about using the ruler to measure lengths. I introduce the concept of centimeters again and the students can discover the concept of millimeters. The aim is to learn how to position the ruler so that the measurement starts at 0. I also show how to draw lines of different lengths.
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E60 : Mesurer des masses

6 min 7 s
After comparing masses with a Roberval balance, children discover in this video how to measure in grams and kilograms. In particular, it is described how to measure using Roberval's balance and weights (making sure the balance is balanced). Several exercises reinforce this concept. I have also included exercises to help children…
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E61 : Multiplier des nombres décimaux

4 min 52 s
Once students have mastered decimal numbers and multiplication, they can begin to multiply decimal numbers. The idea is to learn to position the numbers before starting the calculation. To do this, simply ignore the decimal point at first and simply perform the multiplication. When it is done, you have to count the number of digits…
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E62 : Nombres décimaux et fractions décimales

7 min 37 s
Decimal fractions and decimal numbers describe new numbers to compensate for the inadequacy of whole numbers, especially for measuring length. The graduated ruler is one of the first encounters students have with decimal numbers. This video is an introduction to decimal fractions and decimal numbers. A decimal fraction is a division…
    Levels:
    Élémentaire 1re année 2e année 3e année
    Subjects:
    Mathématiques Nombres