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Adding in a clever order

You learn to work out a long addition cleverly by adding two numbers together first.

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How to work it out

  1. Look for two numbers that make 10 or 100 together.
  2. Add those two first.
  3. Then add the last number.

7 + 8 + 3 = ?

  1. Look for two numbers that make 10: 7 and 3.
  2. Add those first: 7 + 3 = 10.
  3. Then add the 8.
  4. 10 + 8 = 18.
More examples

35 + 19 + 65 = ?

35 + 65 = 100, and 100 + 19 = 119.

4 + 9 + 6 = ?

4 + 6 = 10, and 10 + 9 = 19.