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Published in:
1977 | OriginalPaper | Chapter
Multiplication and Division
Author : Harold Ward
Published in: Business Arithmetic
Publisher: Macmillan Education UK
Included in: Professional Book Archive
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This is really repeated addition, and if we wanted to multiply some number by 17, we could write it down 17 times, in a vertical column, and add the numbers. This method would be tiresome in ordinary arithmetic, but it is the principle used by mechanical calculating machines.