The Joy of 9

Contributor(s): The Great Courses (Firm) [dst] | Kanopy (Firm) [dst]
Publisher: The Great Courses, 2007Publisher: [San Francisco, California, USA] : Kanopy Streaming, 2017Description: 1 online resource (streaming video file) (32 minutes): digital, .flv file, soundContent type: two-dimensional moving image Media type: video | computer Carrier type: online resourceSubject(s): MathematicsGenre/Form: Educational films. Online resources: A Kanopy streaming video | Cover Image Summary: Adding the digits of a multiple of 9 always gives a multiple of 9. For example: 9 x 4 = 36, and 3 + 6 = 9. Inmodular arithmetic, this property allows checking answers by "casting out nines." A related trick: mentally computing the day of the week for any date in history.
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Film

Originally produced by The Great Courses in 2007.

Adding the digits of a multiple of 9 always gives a multiple of 9. For example: 9 x 4 = 36, and 3 + 6 = 9. Inmodular arithmetic, this property allows checking answers by "casting out nines." A related trick: mentally computing the day of the week for any date in history.

Mode of access: World Wide Web.

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