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Soustractions posées sans retenues

S1 E64
·
2018

This video aims to teach you how to do subtraction without carryovers. The idea is to understand that subtraction is only to be done in certain situations (1000-980 or 100-18 are not included, for example). The students must then remember to line up the units, tens, etc. After placing the numbers with the largest above, they calculate each subtraction starting with the units.

Levels:
Élémentaire 3e année 4e année 5e année
Subjects:
Mathématiques Nombres
Skills:
Apprentissage autonome Pensée critique Résolution de problèmes
French level:
A2 : Intermédiaire ou de survie B1 : Seuil
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E18 : Additionner 3 nombres

5 min 2 s
After having mastered two-number addition, students can discover three-number addition. The first technique proposed is linear addition starting on the left and going to the right. Next, I suggest combining the numbers to form doubles and facilitate the calculation. This procedure requires that the doubles be well mastered so that…
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E19 : L'addition des dizaines entières

3 min 59 s
This video discusses addition and subtraction of whole tens. When students have studied numbers up to 100, they have also learned some calculation strategies. These strategies can work but are not always effective. So I propose a technique that relies on the tens in order to do the calculations more quickly. It involves adding the…
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E20 : Additionner et soustraire des nombres décimaux

3 min 18 s
After understanding what a decimal number is, students discover how to perform addition and subtraction with decimal numbers. The element to remember is the alignment of the commas and therefore the units, hundreds, tenths, hundredths, etc. When the alignment is well done, the techniques of addition and subtraction remain the same…
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E21 : Les nombres jusqu'à 10

5 min 3 s
This video is about writing numbers from one to ten in letters. The objective is to recognize and write numbers in letters.
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E22 : Additions posées avec retenues

5 min 58 s
This video is about addition with a carry. It is preferable to have a good knowledge of addition without a carry before starting this new concept. I use the representation of tens and units in the form of cubes in order to concretize the addition of a ten. Indeed, holding is often abstract and it is therefore necessary to use concrete…
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E23 : Les aires

5 min 47 s
This video focuses on measuring in square meters. The square meter is the unit of measurement for areas. And the area measures the surface.
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E24 : Calcul de durée

6 min 48 s
In this video, students learn how to calculate a time between two points in time. Using real-life situations, students learn two strategies for calculating time. The first technique is to go through the nearest full hours. In three steps, it is possible to find a duration. From the beginning of an event, go to the next full hour and…
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E25 : Centaines, dizaines, unités

7 min 11 s
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. …
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E26 : Comparer des longueurs

5 min 35 s
The purpose of this video is to introduce students to length comparison (big, small, short, long). The first step is to make a direct comparison by approaching the objects and aligning them on one side. The direct comparison can be done with the naked eye. If the objects are too far apart, it is necessary to use an intermediate object…
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E27 : Comparer des masses

4 min 53 s
This video introduces the concept of mass (to be distinguished from weight) and how to compare them. They discover the Roberval balance and how it works. The exercises proposed allow them to find the heaviest and lightest objects. They also ask to place objects according to the position of the scale.
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E28 : Comparer des nombres entiers

6 min 43 s
Comparing and ordering are important steps in number manipulation. This video aims to teach some techniques for comparing numbers based on the concepts of tens and units. The idea is to start with a comparison of tens and then compare the units if necessary. This video also reminds you how to use the comparison sign and what the…
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E29 : Comparer et ranger les nombres décimaux

5 min 59 s
After making the connection between decimal fractions and decimal numbers, this video gives techniques for comparing and ordering decimal numbers. The first step is to compare the whole numbers and then, in case of equality, to compare the decimal numbers (tenths, hundredths, thousandths, etc.). The technique remains the same for…
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E30 : Comparer et ranger les nombres jusqu'à 10

5 min 58 s
Comparing and ordering are important steps in number manipulation. The purpose of this video is to introduce students to number comparison by first focusing on quantities. This way, students can make direct comparisons between several objects. Gradually, I propose only the numbers. Then, I give a technique for arranging numbers in…
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E31 : Comparer et ranger les nombres jusqu'à 19

5 min 10 s
Comparing and ordering are important steps in number manipulation. This video aims to teach some techniques for comparing numbers based on the concepts of tens and units. This way, students can realize that for numbers greater than 10, it is possible to compare only the units. I first suggest comparisons with the help of the cubes and…
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E32 : Débuter les additions

6 min 16 s
This video is an introduction to addition. The children understand the meaning of addition (add) and the meaning of the + sign. A few exercises help to familiarize them with the calculations. We also discuss techniques that children can use: fingers, cubes (or other objects), memorizing one of the numbers, the numerical frieze.
    Levels:
    Élémentaire 3e année 4e année 5e année
    Subjects:
    Mathématiques Nombres
    Skills:
    Apprentissage autonome Pensée critique Résolution de problèmes
    French level:
    A2 : Intermédiaire ou de survie B1 : Seuil