When you think of matrices as transforming space, rather than as grids of numbers, so much of linear algebra starts to make sense.

The Internet is older than you might think!

A beautiful proof of why slicing a cone gives an ellipse.

The determinant has a very natural visual intuition, even though it's formula can make it seem more complicated than it really is.

A bit of the history behind how we came to use the symbol "pi" to represent what it does today, and how Euler used it to refer to several different circle constants.

After a friend of mine got a tattoo with a representation of the cosecant function, it got me thinking about how there's another sense in which this function is a tattoo on math, so to speak.

A video entitled "Add and Subtract Expressions" which shows how before adding and subtracting expressions it's important to understand written and unwritten coefficients.

Howcast - One of the smartest things you can do -- besides getting a college degree -- is to find the least expensive way to pay for it. Following these guidelines will help.

Howcast - One of the most popular summer sports worldwide, beach volleyball is a fun, social, and skill-building activity.

Howcast - Learn about DJ DP One of Rock and Soul DJ School, one of Howcast's DJ'ing experts, in this video.

A collection of pieces of information, organised and categorised for some purpose.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

To vary from one extreme to another, generally with a regular interval.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig...

A unit for measuring frequency, equal to one thousand hertz or cycles per second.
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Key scientific terms defined in just 60 seconds using stunning images and concise textual...

By the end of this learning object, the student will be able to: Summarize the lesson & understand how to solve any inequality.86708

By the end of this video, the student will be able to: Recognize the first property of the inequality relation in N and Z.9492

By the end of this learning object, the student will be able to: Recognize the properties of the equality relation in N and Z.9486

By the end of this learning object, the student will be able to: Summarize & review the important points in the lesson.86707

Mr. Addit explains the value of $10, $5, and $1 bills. He explains that we count bills by the largest value first, the same way we count coins.

Mr. Addit provides an overview of base ten blocks. He relates counting with base ten blocks to using the place value chart.

Yoga Freeze Dance: Action Song for Kids

Mr. Addit teaches about place value through the millions by introducing the idea of the base 10 system and using base 10 blocks.

Miss Palomine hosts a game show called Guess Who I Am. The student is challenged to answer questions about the penny, the nickel, the dime, and the quarter.

Miss Palomine is about to drive the swimming team to the pool for practice when she remembers there are fourteen kids on the swimming team. She shows the number 14 card, finds fourteen on the number line, and practices counting with the...

We find Miss Palomine at an amusement park. She talks about how she and her friend April are each in a line of ten. All together, there are twenty people in line. When one leaves, there are now nineteen people. This begins a discussion...