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Addition and subtraction within 100

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The question

87 − 19

717 87 19 68
  1. 87 − 19, written in columns. Start at the RIGHT, with the ones.
  2. 7 is too small to take 9 from, so a ten comes across from the left: the ones now holds 17. 17 − 9 = 8.
  3. This column gave a ten to the right, so it is now 7, not 8. 7 − 1 = 6.
  4. That is the whole sum: 87 − 19 = 68.

How it works.

  1. 01

    87 − 19, written in columns. Start at the RIGHT, with the ones.

  2. 02

    7 is too small to take 9 from, so a ten comes across from the left: the ones now holds 17. 17 − 9 = 8.

  3. 03

    This column gave a ten to the right, so it is now 7, not 8. 7 − 1 = 6.

  4. 04

    That is the whole sum: 87 − 19 = 68.

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