• 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

Common mistakes on the 2's complement inversion:

• 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