Dozenal Divisibility Tests Quick Guide

Title: Dozenal Divisibility Tests Quick Guide
Author: Treisaran
Year: 11E9
Subject: Dozenal divisibility tests
http://www.dozenal.org/drupal/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.