The Dozenal Society of America

“A Brief Introduction to Dozenal Counting”
Prof. Gene Zirkel, 1995, db38206.
Prof. Zirkel describes the origins of our base ten system, why dozenal is superior to decimal as a number base, and some dozenal basics. Download the British version.

“Fundamental Operations in the Duodecimal System” NEW!
by Prof. Jay Schiffman, 1982, db31315 & db32204.
A highly recommended, thorough explanation of the four basic operations (addition, multiplication, division, and subtraction) in base twelve. Prof. Schiffman rigorously walks us through how one computes in dozenal, using decimal as an analogy to the dozenal processes. Download the British version.

“Decimal-Dozenal Conversion Rules”
Prof. Gene Zirkel and others, 2005.
This document offers rules and examples for converting decimal numbers to dozenal and vice versa. The material is partially drawn from pages 19;-20; of the Manual of the Dozen System.
Download the British version.

“Key Dozenal Fractions”
by the Editor, 2011, db4E224.
One of the reasons duodecimal is superior to decimal and any other human-scale number base is its simple representation of the commonest fractions, the half, thirds and quarters. This article includes graphs that may help elucidate this fact.

“Featured Figures: Basic Operations”
by the Editor, 2008, db49224.
This inaugural edition of Featured Figures issues fresh duodecimal addition and multiplication tables.

“Eggsactly a Dozen”
Prof. James Malone, 1981, db2610b.
A Nassau Community College professor shares a simple way to look at dozenal conversion of decimal whole numbers.

“Manual of the Dozen System”by the DSA, 1960.
This is a classic manual which was distributed to Members and interested corresponders, which contains descriptions of various basic dozenal concepts. Tables of logarithms, exponents, and fractions are included. Also includes part of Henry Churchman’s dozenal system of measure and a section offering dozenal references.