- Convert 42 from decimal to binary

42=101010 - Convert 11011 from binary to decimal

11011=27 - Add the following binary numbers: 11010 + 101111

11010 + 101111 = 1001001 - Convert -6 from decimal to 4-bit 2's complement

-6 = 1010

- n-bit 2's complement numbers must have exactly n bits (perhaps with leading 0s)
- "flip the bits" means replace 0s with 1s and 1s with 0s in each bit position
- Remember to add 1 after flipping the bits