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Adding 3-Digit Numbers: Learn

How to add three-digit numbers (for example 529 + 733).
  • Place one number above the other so that the hundreds, tens and ones places are lined up. Draw a line under the bottom number.
    5 2 9
    + 7 3 3
  • Add the ones place digits (9 + 3 = 12). This number is larger than 10 so place a one above the tens place column and place the two below the line in the ones place column.
    1
    5 2 9
    + 7 3 3
    2
  • Add the tens place digits (1 + 2 + 3 = 6) and place the answer below the line and in the tens place column.
    1
    5 2 9
    + 7 3 3
    6 2
  • Add the numbers in the hundreds place column (5 + 7 = 12) and place the 2 below the line and before the other number below the line. Place the 1 from the twelve above the thousands place column.
    1
    5 2 9
    + 7 3 3
    2 6 2
  • The thousands place column only has a 1 in it which should be placed below the line in the thousands place column.
    1
    5 2 9
    + 7 3 3
    1 2 6 2

Adding Three-Digit Numbers: Practice

What is the Sum of the two Numbers?

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