Dividing Fractions (one-half divided by one-half)
This instructor makes it look easy! In an easy conversational tone, the instructor uses the computer screen as his 'blackboard' and different colors to emphasis his points. As this is an introduction to dividing fractions, this video is for older elementary students. (08:58)
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Rhombuses, Parallelograms, Trapezoids
Lesson on rhombuses, parallelograms, and traezoids.  This lesson is an introduction to these figures that come up in geometry.  Larry explains figures on a white board. More lessons at: http://www.MathWithLarry.com

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Properties of Logarithmic Functions - Yay Math
Introduction to and using the properties of logarithmic functions. 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=3682262730665786723&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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Exponential and Logarithmic Equations - Yay Math
Solving exponential equations by using a common base. Introduction to logarithmic notation. 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=-7783301627139702841&q=source:012956945238798337823&hl=en Produced by Robert Ahdoot, yaymath.org
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Averages (in Algebra)
Introduction to averages and algebra problems involving averages. This video starts off with a black screen because the narrator uses it as a 'chalkboard'. This video is appropriate for older mddle and high school students.
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Web 2.0 in the Classroom
This is a short video about an introduction to Web 2.0 for teachers. It lists the main uses of Web 2.0 and some of its advantages. There is also reference to what teachers could do to learn more about it.
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Simba Sings The Math Song
A cute introduction to elementary math. (1:59)
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How Is Math Used in Baseball?
This short video is from Jimmy Chang, who has a master's degree in math and has been a math teacher at St. Pete College for more than eight years. Â Mr. Chang discusses statistics using baseball.
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How to Find Probability and Chance
This five minute video doesÂ a very good job of explaining probability. This is good for most age groups. You need to have a follow-up activity to use, especially in using groups to work on this concept. A good introduction video.
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Song: Coin Counting Introduction
An introduction to U.S. coins and their value in cents along with counting byones, fives, tens, and twenty fives.
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U.S. Customary and Metric Units
In this video Sal Khan discussesÂ the standard units of the United States and the metric system used in many other countries.Â  (05:10) The instructor uses computer software for demonstration.
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Capacity - Standard Measurement
This is a great basic introduction to the concept of capacity using standard measurement. Students work together to give examples of various ways to measure capacity in this video.
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Telling Time - by the Hour
A simple video to help toddlers learn to tell time. Both standard clock, and digital clock faces are shown - while the narrators reads the correct time. Only hourly times are presented (1:00, 2:00, 3:00 etc.).
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Introduction to Friction
Correction of definition of "normal force" and an introduction to the coefficient of friction. This video, which is suitable for high school students, starts with a black screen because the instructor, in his conversational tone, uses it as a 'chalkboard.' (09:25)
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Match the Time - from a Standard Clock - to a Digitial Clock Display
In this brief video clip - watch Mr. Mouse, earn a piece of cheese, by helping to match the correct time on a standard clock face - with the correct time on a digital clock display. (song)
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An informal introduction to why we need to learn about fractions, with examples from sports, food, etc.Â  This is the introduction to a longer lesson (Lesson 6) consists of a general tutorial about fractions. NOTE: the use of printed notes is integrated with the video (although not this introductory segment of the video).Â  Just the teacher in front of a whiteboard, with some silly introductory stuff.Â  The actual content begins around 1:45.

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Building the Great Pyramid - Part 1 of 6
This video is the first part of a reconstructed life story of Nacht, one of workers who was part of building king Kufu's great pyramid. The introduction shows the setting in place and time 2480BC in the Sahara desert. There are recontructed images and explanations of the way in which the pyramids were built.
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Introduction to Cellular Respiration
The instructor uses software (and several colors for clarification)Â to offer an introduction to cellular respiration, glycolysis, the Kreb's Cycle, and the electron transport chain.
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Piranhas
For centuries the Amazon has been home to the most ferocious fresh-water monsters known to man...piranhas. Now, these deadly creatures are appearing in US lakes and rivers. The MonsterQuest team investigates whether these carnivorous beasts could breed here and devastate our waters. Addresses the harmful introduction of a new species to an ecosystem. Full-length episode from MonsterQuest.Â  Run time (41:00)
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Forces that Shape our Earth
Geologists observe that the forces that shape our Earth are very slow, but ever present.Â  The video will fly you over the rugged terrain and deeply carved canyons of the southwest United States as the narrator discusses the forces that are at work. The video is simply an introduction to the lesson and does not explain any of the forces in detail.Â  Run time 03:06.
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