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Promoting base twelve and alternative base mathematics
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The Dozenal Society of America
The DSA is a voluntary, nonprofit education corporation, organized for the conduct of research and education of the public in the use of dozenal (also called duodecimal or base-twelve) in calculations, mathematics, weights and measures, and other branches of pure and applied science.

A Dozenal Primer

Title: A Dozenal Primer
Author: Dozenal Society of America
Year: 1200
Subject: A brief explanation of the dozenal system designed for beginners, in only a dozen pages
DSA_primer.pdf
This little book is designed as a quick and easy introduction to dozenal for those who have no interest or knowledge of them. Weighing in at only a dozen pages, it is an ideal way to display the advantages of dozenal without overwhelming the non-mathematically-inclined. Available for sale at Lulu.
© 11E9-1209 (decimal 2013-2025). The Dozenal Society of America. Contact Us
Creative Commons License
This website and the documents on it are licensed under a Creative Commons Attribution 3.0 Unported License.
Numeration on this site is in dozenal (also called duodecimal, or base twelve), using "X" for ten and "E" for eleven.
0 1 2 3 4 5 6 7 8 9 X E 10 11 12 13 14 15 16 17 18 19 1X 1E 20 21 22...
PDF documents may use a Dwiggins stylized "X" and "E" or the Pitman inverted "2" and "3".
The Humphrey point, or semicolon, is used for fractional parts; e.g., "0;6 = 0.5."