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Measuring weight in the metric system
MathMammoth
246 views
We take a look at grams and kilograms for measuring weight in the metric system. I give some "ballpark" weights, and then we do some easy conversion problems. Lastly, I so...
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Volume of a rectangular prism and cubic units
MathMammoth
289 views
Volume is measured in cubic units, or "little cubes". If the sides of your "little cube" are 1 cm, then it is 1 cubic centimeter. Similarly, if the sides of your "little cu...
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Conversions between inches, feet, and yards
MathMammoth
528 views
I explain how to change (convert) between an amount in feet an inches, and inches, such as 4 ft 6 in to inches. Then, we do it the other way around: an amount in inches int...
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Polygons - introduction
MathMammoth
239 views
This is an introduction to polygons for elementary school - approximately 4th grade.
I like to give students the exercises of drawing randomly 4, 5, 6, 7, or 8 points on...
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Circles - introduction
MathMammoth
160 views
What is a circle? It is a figure where the distance from the center point to any point on the outer line (circumference) is the same. So, that is why an oval won't classify...
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Acute, obtuse, and right triangles
MathMammoth
257 views
This lesson is a starting point for classifying triangles by their angles.
A right triangle has one right angle. (What about the other two angles? We'll find out.)
A...
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Parallelograms
MathMammoth
140 views
What is a parallelogram? The definition says it's a figure enclosed by two sets of parallel lines, and that's where we will start. The DEFINITION does not say a thing about...
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How to use a protractor to measure & draw angles
MathMammoth
601 views
I explain what an angle measure is, how to measure angles with a protractor, and how to draw angles with a protractor.
When an angle "opens", it draws an arc of a circle...
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Estimating angles
MathMammoth
137 views
Estimating angle measures is based on comparing them to some ballpark angles, such as the right angle, the 45° angle, and the 30° angle (which is the angle between two cons...
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Divide fractions: an alternative algorithm
MathMammoth
308 views
In this alternative algorithm for fraction division we first convert the two fractions to have the same denominator (like fractions). Then, we simply divide the numerators,...
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