One bag of apples, one apple, one slice of apple -- which of these is
one unit? Explore the basic unit of math (explained by a trip to the
grocery store!) and discover the many meanings of one. (03:55)

The instructor breaks the problem down so that the viewer can understand how to: Find the value of the '3' in 4, 356. The viewer may wish to open the video to 'full screen' as there is a lot of writing on a small black screen. Sal Khan was the recipi...ent of the 2009 Microsoft Tech Award in Education. (02:24)[more]

A great educational video to use in a math class showing place value in standard form, expanded form and word form. Several examples are provided using computer animation. (03:37)

Mr. Khan uses place value to show how to write 14,987 in expanded form. Mr. Khan uses the Paint Program (with different colors) to illustrate his points. Sal Khan was the recipient of the 2009 Microsoft Tech Award in Education. (05:19)

Each digit in a number has a value. That means that a digit's place determines its value. Once you know the place values of numbers, reading any number will be a breeze. Learn more about place value with this cartoon animation from StudyJams. A s...hort, self-checking quiz is also included with this link.[more]

Learn Math Digits and Place Value with this fun animated math video. This video is a help to those learning math who want to learn about digits and place value. (02:12)

Reading big numbers is easy! Some things to know include: each period has a name and a comma shows where each period ends. This is a great resource to introduce and/or review place value in the elementary classroom. (2:21)

In this video, the instructor shows how to write a nine-digit number in standard form. Mr. Khan uses the Paint Program (with different colors) to illustrate his points. Sal Khan was the recipient of the 2009 Microsoft Tech Award in Education. (04:09)

Please make your comments on categories positive, and not just negative.

People work hard on educational categories, and we want to encourage them to make more!

Profanity (curse words), sexually suggestive remarks, and other such obviously inappropriate comments
will be deleted immediately, and are grounds for immediate expulsion. Remember, children use this website.

Personal criticism on project forums and in video content is not allowed and will be deleted immediately.
Any violations of this rule could result in expulsion from the project so please, no insults or other negative
personal remarks.

Very harshly-worded criticism of content will also be deleted promptly. Please use your vote to express your
harshest feelings. Repeated violations of this rule can result in expulsion. If you must criticize another
person's hard work, then be nice about it.

People work hard on educational categories, and we want to encourage them to make more!