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Addition with regrouping

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The question

12 + 38

1 12 38 50
  1. 12 + 38, written in columns. Start at the RIGHT, with the ones.
  2. 2 plus 8 makes 10. That is more than 9, so write 0 in the ones and carry 1 to the left.
  3. Add the carried 1 as well: 1 + 1 + 3 makes 5. Write 5 in the tens.
  4. That is the whole sum: 12 + 38 = 50.

How it works.

  1. 01

    12 + 38, written in columns. Start at the RIGHT, with the ones.

  2. 02

    2 plus 8 makes 10. That is more than 9, so write 0 in the ones and carry 1 to the left.

  3. 03

    Add the carried 1 as well: 1 + 1 + 3 makes 5. Write 5 in the tens.

  4. 04

    That is the whole sum: 12 + 38 = 50.

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