# Binary

### Learn how to add and subtract binary!

## What is binary?

Binary is one of the computer codes that programs the computer to send signals from the CPU to other components of the PC. There are only 2 types (or if you already know binary, 10) of numbers used in the code. They are 0 and 1. Each digit is a bit. 1 digit is 1 bit. 4 digits are 4 bits (or a nibble). 8 digits are 8 bits, and so on and so forth. With enough bits, they make a byte. Enough bytes, kilobytes. Kilobytes to megabytes to gigabytes to terabytes.

Each number is worth double of the previous number. The first digit is 1, the second 2 and the third 4. It carries on like an exponential sequence.

## Adding Binary

## How do you add one binary code with another?

Remember these rules: odd+odd= even , odd+even= odd. What they basically mean is that 1 (which represents odd) plus by itself would make an even (which is represented by 0). Eg, 10+01= 1+0= 1 and 0+1=1. The answer is 11 but in bit form, it is 3.

## Subtracting binary

This is harder than adding. The same rules apply, but in subtraction form. For example, 1-1= 0 and 1-0= 1. For example, 100-010= 4-2=2 which is shown as 010. A bigger example would be 10101-01001= (16+4+1)-(8+1)= 21-9= 12. You make the number into binary, which is 01100.