• Add the ones. Add 4+5.
  • 1 4+5 =9
  • Add the tens. Bring down the 1.
  • 1 4+5=1 9
  • The sum is 19.
  • Add the ones. Add 2 + 3.
  • 2 + 13 = 5
  • Add the tens. Bring down the 1.
  • 2 + 13 = 15
  • The sum is 15.
  • Add the ones. Add 3 + 5.
  • 13 + 5 = 8
  • Add the tens. Bring down the 1.
  • 13 + 5 = 18
  • The sum is 18.