The 2’s complement of binary number is obtained by adding 1 to the Least Significant Bit (LSB) of 1’s complement of the number, so for example:

Step 1: Begin with the original binary value

```
10011001 Original byte
```

Step 2: Find the one’s complement

```
01100110 One's complement
```

Step 3: Add 1 to the one’s complement

```
01100110 One's complement
```

## + 1 Add 1

```
01100111 <--- Two's complement
```