Rays
Students learn the definitions of a segment, a ray, and length, as well as the symbols that are used in Geometry to represent each figure. Students also learn the definitions of an endpoint, opposite rays, a coordinate, and a number line. Students are then given geometric figures that are composed of segments and rays, and are asked true/ false questions about the given figures. Students are also given number lines, and are asked short answer questions about the given number lines. Students are
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SEGMENTS AND RAYS
This short powerpoint presentation is designed to help the high school students really appreciate the beauty of mathematics and its real life application.
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Multiplication Facts for the 5s
Set to music, students will have the five times table memorized in no time. Equations appear, one at a time, on a slide with black background. Â Singer chants the equations. Â  Repeats facts several times. Â (4:21)
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Multiplication Facts for the 6s
Set to music, elementary students will have the six times table memorized in no time. Equations appear one by one on a slide with a black background. Adult chants the equations and group responds with the answer. Repeats several times. The between the repetitions are a bit strange. (7:38)
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Definition of Slope
One of the most important things to understand about lines is the definition of slope. Slope is the 'steepness' of the line, also commonly known as rise over run. This video clip explains how to calculate slope by dividing the change in the x-value between two points over the change in the y-value. In order to understand the importance of the definition of slope, one should understand how to interpret graphs and how to write an equation. (5:07)
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Acute, Obtuse and Right Angles Song
To a rocking tune of Old McDonald Had a Farm, this video features students singing a simple song that teaches acute, obtuse, and right angles. Students form the angles with their hands.  (01:04)
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Angles
This is a rap song about angles.  The song explains acute, right, and obtuse angles.  The animations of the angles are clear.  This would be a fun introduction to angles. (01:56)
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How to Factor a Trinomial with a Greatest Common Factor
Teacher works through an example of factoring a trinomial with a greatest common factor. He standing in front of and using a whiteboard. Sample video lesson-the complete lesson is at yourteacher.com -solves one equation.(2:14)

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Factoring Trinomials
Illustrates the steps for factoring a trinomial through writing on basic text slides. Many examples given. Although not very exciting, it would make a good tutorial for a student who is struggling with homework. Grades 8-12. 29:27 min.
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Introduction to Factoring Trinomials - Yay Math
Removing common factors and using FOIL to reverse engineer trinomials to find the factors. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=5372924760957296665&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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Perfect Square Factoring and Square Root Property - Yay Math
Factoring Perfect Square Polynomials, as well as solving equations using the Square Root. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=-2174037250498841062&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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The FOIL Method - Multiplying Binomials
Students learn to multiply two binomials together using the F.O.I.L. method: First, Outer, Inner, Last. For example, to simplify (2x + 3)(x -- 5), take the product of the First terms, which is 2x^2, plus the product of the Outer terms, which is --10x, plus the product of the Inner terms, which is +3x, plus the product of the last terms, which is --15. So the problem reads 2x^2 -- 10x + 3x -- 15. Finally, combine the like terms --10x + 3x, to get --7x, so the final answer is 2x^2 -- 7x -- 15.
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How to Determine the Circumference and Area of a Circle
Learn how to determine the area and circumference of a circle in this seven-minute tutorial. The teacher uses computer software for instruction.
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Solving Rational Equations - Yay Math
Many examples of manipulating fractions that include variables in order to solve equations. White board in a class setting, some interaction, engaging, several examples of increasing complexity. The discussion is clear and understandable. Preview - full version at http://video.google.com/videoplay?docid=-1558392479512220339&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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Matrix Multiplication (Part 1) - Khan Academy
The instructor demonstrates how to multiply two 2 x 2 matrices. Mr. Khan uses a software program (emphasizing with different colors) to illustrate his points. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small. (13:40)
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Matrix Multiplication (Part 2) - Khan Academy
The instructor uses an electronic chalkboard to demonstrate Matrix Multiplication.  At the time of this posting from WatchKnow, this video was a Featured Video on YouTube. The instructor, Sal Khan, continues from Part 1 on multiplying matrices. The student or educator may want to open the video to 'full screen' as the instructor is using a black background and the writing is small. (14:37)
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Solving Limits Algebraically
Explains how to solve limits using the methods of algebra. Also, the presentation notes instances where limits cannot be found algebraically. Animated graphics on white board. The explanation is clear and understandable.Provided by http://www.free-academy.com...
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Calculus General Limit
This video offers a description of the general limit theory in Calculus. Â An explanation on when a limit exists is given. Â Several situations are discussed
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The Giants of Philosophy - Arthur Schopenhauer - 13/18
'Arthur Schopenhauer (22 February 1788 â€“ 21 September 1860) was a German philosopher known for his atheistic pessimism and philosophical clarity' (Arthur Schopenhauer, Wikipedia, 2009). He was influenced by Plato and Kant, and he, in turn, inlfuenced Einstein, Freud, and Jung among others. Suitable for high school students. Video consists of one still image and narration.
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Theories of Democracy
This video is accompanied by text. "In his 1863 Gettysburg Address, Abraham Lincoln defined democracy as "government of the people, by the people, for the people." These words have come to mean different things to different people and have sparked debate over whether the U.S. government really responds to the will of its citizens.
Four theories of democracy have taken shape over time, each addressing the questions of who holds power and influences public policy. The Traditional Theory of D

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