Concentration (constant difference)

A thinking mathematically context for practise, focussed on identifying related subtraction equations with a constant difference


Syllabus outcomes and content descriptors from Mathematics K–10 Syllabus © NSW Education Standards Authority (NESA) for and on behalf of the Crown in right of the State of New South Wales, 2023


  • MAO-WM-01
  • MA1-CSQ-01

Collect resources

You will need Constant difference cards (PDF 1.1 MB)


  • To set up a game of concentration (also known as memory or pairs), first shuffle the cards well and then place each card face down.
  • Each player takes a turn by turning two cards over.
  • If the cards match, then the player picks up the cards and keeps them.
  • If they don't match, the player turns the cards back over.
  • You can also play by yourself.
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