The DSA is a voluntary, nonprofit educational 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 Successful Annual Meeting for 11EX!
The DSA held its annual meeting in Richmond, VA on 12; (14.) November 11EX (2014)! Read all about it!
Why do some people propose that we learn to count in twelves in addition to counting by tens? Why did people who use arithmetic every day - engineers, teachers, mathematicians, businessmen and consumers - choose to band together and form the Dozenal Society of America (formerly called the Duodecimal Society of America)? Isn’t counting by tens easier, especially with the zero? What about decimal fractions such as 3.14159...? To find out the answers to these and similar questions, visit "Fundamental Operations in Duodecimal”. If you're a frequent visitor, check out what's new! Full Article about Welcome to the Dozenal Society of America
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."