AC9M4N07 • Year 4 Maths

Estimation, Rounding and Reasonableness (AC9M4N07)

choose and use estimation and rounding to check and explain the reasonableness of calculations including the results of financial transactions

Choose a learning activity. Practice and Test use short shuffled attempts. Repeat quiz practice to access more of the full question bank.

Unit focus

  • A useful estimate is close enough for the purpose and simple enough to calculate mentally. Rounding to tens, hundreds or thousands should be chosen deliberately rather than automatically.
  • Use this routine: Identify purpose → Choose rounding level → Estimate → Calculate → Compare → Explain reasonableness.
  • Watch for always round to the same place: Choose precision based on purpose.
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