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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.

Dozenal Divisibility Tests Quick Guide

Title: Dozenal Divisibility Tests Quick Guide
Author: Treisaran
Year: 11E9
Subject: Dozenal divisibility tests
http://www.dozenal.org/../sites_bck/default/files/DSA_treisaran_div_tests.pdf
An invaluable resource for anyone who wants to become more adept with dozenal arithmetic, particularly mental arithmetic. This fact sheet puts together all the major divisibility tests of the dozenal system into a single, easy-to-learn and easy-to-understand package.
© 11E9-1205 (decimal 2013-2021). The Dozenal Society of America. Contact Us
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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."