Adding Two-Digit Numbers

How to add two two-digit numbers (for example 45 + 53).

  • Place one number above the other number so that the tens' place digits and ones' place digits are lined up. Draw a line under the bottom number.
    • 45
53
  • Add the two ones' place digits (5 + 3 = 8). 
    • 45
53
 8
  • Add the numbers in the tens' place column (4 + 5 = 9) and place the answer below the line and to the left of the ones' place sum.
    •  45
 53
 98

Find the Sum of the two Numbers

  +     =     

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Copyright (C) 2004 J. Banfill. All Rights Reserved.