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Addition within a hundred

You learn to add and subtract to 100 by keeping the tens and the ones apart.

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How to work it out

  1. Split both numbers into tens and ones.
  2. Calculate the tens with tens.
  3. Calculate the ones with ones.
  4. Add the two results together.
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SplittingTens and ones apart

65 + 22

  1. Tens: 60 + 20 = 80.
  2. Ones: 5 + 2 = 7.
  3. Put them together: 80 + 7 = 87.
More examples

76 − 12

  1. Tens: 70 − 10 = 60.
  2. Ones: 6 − 2 = 4.
  3. Put them together: 60 + 4 = 64.
JumpingJump along the number line
SplittingTens and ones apart

44 + 25

  1. Tens: 40 + 20 = 60.
  2. Ones: 4 + 5 = 9.
  3. Put them together: 60 + 9 = 69.
JumpingJump along the number line
SplittingTens and ones apart