Have you ever used a number system other than base-ten or decimal?

The number system used by almost all human cultures is called base-ten or decimal. There are ten digits (1, 2, 3, 4, 5, 6, 7, 8, 9, 0) which each represent a power of ten such as 1, ten, a hundred, a thousand, a tenth, and etc. The best explanation for why this is so is because humans have ten fingers.

However, there are other ways of writing numbers. Binary or base-2 uses only two digits (0 and 1) to represent powers of 2 such as 1, 2, 4, 8, 1/2, 1/4, 1/8, etc. This is often used in computers. Computers also have stuff encoded in base-sixteen, sixteen being a power of 2.

One notable system is base-twelve (or the dozenal system) that is being advocated due to twelve having many divisors (1, 2, 3, 4, 6, and twelve/dozen itself.)