Binary-coded decimal

Binary-coded decimal is a way of showing numbers using only ones and zeros. When we write numbers, usually we use a special way of writing called "decimal". It uses the numbers 0-9. But computers use ones and zeros, also known as 'binary'. So to make it easier for computers to understand our numbers, we use something called binary-coded decimal. This is a way of taking the numbers 0-9 and turning each one into a group of ones and zeros. For example, the number 3 can be turned into the binary number 0011. Binary-coded decimal is one way that computers understand our numbers.