AC9M3A01 • Year 3 Maths

Addition and Subtraction as Inverse Operations (AC9M3A01)

recognise and explain the connection between addition and subtraction as inverse operations, apply to partition numbers and find unknown values in number sentences

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Unit focus

  • Addition and subtraction undo each other. A whole and two parts create related number sentences that can solve unknown values.
  • Use this routine: Identify whole and parts → Write related facts → Find unknown → Check with inverse.
  • Watch for reversing subtraction freely: Addition is commutative; subtraction usually is not.
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