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Adding decimals, step by step

Adding decimals is column addition with one extra rule: the decimal points line up.

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The question

16.29 + 6.06

11 16.29 6.06 22.35
  1. 16.29 + 6.06. Line the POINTS up under each other — not the right-hand ends. Right-aligning is what turns 12.5 + 3.75 into a tidy-looking wrong answer.
  2. 9 plus 6 makes 15. More than 9, so write 5 and carry 1 to the left.
  3. Add the carried 1 too: 1 + 2 + 0 makes 3. Write 3.
  4. 6 plus 6 makes 12. More than 9, so write 2 and carry 1 to the left.
  5. Add the carried 1 too: 1 + 1 + 0 makes 2. Write 2.
  6. The point in the answer comes straight down from the ones above it — it was never moved, only lined up. 16.29 + 6.06 = 22.35.

How it works.

  1. 01

    16.29 + 6.06. Line the POINTS up under each other — not the right-hand ends. Right-aligning is what turns 12.5 + 3.75 into a tidy-looking wrong answer.

  2. 02

    9 plus 6 makes 15. More than 9, so write 5 and carry 1 to the left.

  3. 03

    Add the carried 1 too: 1 + 2 + 0 makes 3. Write 3.

  4. 04

    6 plus 6 makes 12. More than 9, so write 2 and carry 1 to the left.

  5. 05

    Add the carried 1 too: 1 + 1 + 0 makes 2. Write 2.

  6. 06

    The point in the answer comes straight down from the ones above it — it was never moved, only lined up. 16.29 + 6.06 = 22.35.

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