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AC9M4N07

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

Elaborations

  • AC9M4N07_E1using proficiency with basic facts to estimate the result of a calculation and say what amounts the answer will be between; for example, 5 packets of biscuits at $2.60 each will cost between $10 and $15 as 5 × 2=2 =10 and 5×3=3=15
  • AC9M4N07_E2using rounded amounts to complete an estimated budget for a shopping trip or an excursion, explaining why overestimating the amounts is appropriate
  • AC9M4N07_E3recognising the effect of rounding in addition and multiplication calculations; rounding both numbers up, both numbers down and one number up and one number down, and explaining which is the best approximation and why

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AC9M4N07 – choose and use estimation and rounding to check and explain the reasonableness of calculations including the results of financial transactions | LessonForge