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The method of checking addition by casting out nines is a very old one, and the problem of helping the student understand “why and how” it works is equally old! The explanation that follows is taken from a book titled Arithmetic reprinted from the Mathematical Textbook edited by President Webber of...

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Bibliographic Details
Published in:The Arithmetic teacher 1967-03, Vol.14 (3), p.224-225
Main Author: JUNGE, CHARLOTTE W.
Format: Article
Language:English
Subjects:
Arithmetic
In the classroom
Online Access:Get full text
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Summary:The method of checking addition by casting out nines is a very old one, and the problem of helping the student understand “why and how” it works is equally old! The explanation that follows is taken from a book titled Arithmetic reprinted from the Mathematical Textbook edited by President Webber of Cambridge University. It was published in 1812.
ISSN:0004-136X
DOI:10.5951/AT.14.3.0224