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Les unités et les dizaines

S1 E53
·
2018
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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.

Levels:
Elementary Grade 1 Grade 2 Grade 3
Subjects:
Mathematics Number
Skills:
Self-Directed Learning Critical Thinking Problem Solving
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E63 : Se repérer sur un quadrillage

5 min 6 s
Students learn to find their way around a grid by knowing the concepts of column, row and square. They cross the columns and rows to find the box and code it as (A,1). Conversely, they must locate a square based on the location code.
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E64 : Soustractions posées sans retenues

3 min 48 s
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…
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E65 : Unités de longueur (cm, m, km)

5 min 20 s
After comparing lengths in direct and indirect comparison, this video discusses the units of measurement for length. We see what a centimeter, a meter and a kilometer correspond to. Students learn that it is necessary to adapt the unit of measurement to what is being measured. They also discover the tools that are useful for measuring…
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E66 : Utiliser la règle

2 min 39 s
How to draw a straight line? How to hold your ruler? These are the two questions that this video will answer. It's all about positioning your fingers well on your ruler and sticking to the ruler with your pencil (well sharpened). I also show how to draw vertical lines for right and left handed people. Two cards are included with…
    Levels:
    Elementary Grade 1 Grade 2 Grade 3
    Subjects:
    Mathematics Number
    Skills:
    Self-Directed Learning Critical Thinking Problem Solving