Chapter 3


My difference

My difference is a game to help children find the difference between 2- and 3-digit numbers.

Suitable for



  • To subtract combinations of 3- and 2-digit numbers.
  • To refine calculation methods.


  • This game is for small groups of three or four


  • My difference number board
  • Pencil and paper

What to do

  • Give each pair of players a copy of the My difference number grid shown here.Image
  • Explain that the aim of the activity is to find as many pairs of numbers as possible with a difference of 25. For example, 164 – 139 = 25.
  • Challenge groups to find as many as they can.
  • The group with the most ...

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