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Conversions between inches, feet, and yards
MathMammoth
65 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
45 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
16 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
27 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
17 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
193 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
37 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
96 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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The four series of Math Mammoth
MathMammoth
320 views
I explain the difference between the different series of Math Mammoth books:
- Light Blue series is a complete curriculum for grades 1-6;
- Blue Series books are topica...
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How to draw a right angle (perpendicular line) and a rectangle
MathMammoth
99 views
I show how you can draw a right angle (or a perpendicular line to a given line) using either a protractor or a triangular ruler. I also show a line perpendicular to a given...
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