A Simple Course on Microprocessors - Lesson 2 Decimal Vs. Most people have learned to use the Decimal numbering system for counting and calculations. But micros use a different system. It's called Binary.
All numbering systems follow the same rules.
Decimal is Base 10 and Binary is Base 2. The base of a system refers to how many possible numbers can be in each digit position. In decimal, a single digit number is 0 through 9. In binary a single digit number is 0 or 1. Ten is a two digit decimal number.