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.
Practice Your Dozenal Arithmetic
Test your dozenal arithmetic skills! Use "X" for ten
and "E" for eleven. Remember not to calculate in decimal
and convert the answer; calculate in dozenal to help you
memorize the dozenal arithmetic facts. They are much
easier and more regular in dozenal, so this should be a
help in doing so.
Addition |
Subtraction |
Multiplication |
Division
