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The Joy of 9.

Author: Kanopy (Firm),; Great Courses,
Publisher: The Great Courses, San Francisco, Calif. : Kanopy Streaming, 2007 2017
Edition/Format:   eVideo : Clipart/images/graphics : EnglishView all editions and formats
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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Genre/Form: Educational films
Material Type: Clipart/images/graphics, Internet resource, Videorecording
Document Type: Internet Resource, Computer File, Visual material
All Authors / Contributors: Kanopy (Firm),; Great Courses,
OCLC Number: 985048087
Language Note: In English.
Notes: Title from title frames.
In Process Record.
Film.
Description: 1 online resource (streaming video file) (32 min.)
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Abstract:

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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