Are you interested in using different number bases, or you’re studying number bases in school? The articles on this page are a great place to start, particularly for dozenal (also called duodecimal, or base twelve). You can look at
A Brief Introduction to Dozenal Counting to get an idea of what exactly dozenal counting is. An even simpler and easier way to grasp the concept is in
Eggsactly a Dozen. Once you know what dozenal counting is, you can look at
Multiplication in Base Twelve to see the beautiful patterns in the dozenal base, read about the
dozenal divisibility tests, then continue on to
practice your dozenal arithmetic. Learn how to convert decimals to dozenals and back again by visiting
Decimal-Dozenal Conversion Rules. Soon, you'll be using twelve as a number base, multiplying and dividing, adding and subtracting, just as well (better!) than in decimal.