Estimate before checking exactly
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Log in to continueUse benchmarks and nearby numbers to test whether a result is sensible.
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Round 23 to the nearest 10.
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Answer: 20
- Find the two multiples of 10 around 23.
- Choose the nearer one; halfway rounds up. The estimate is 20.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Use benchmarks and nearby numbers to test whether a result is sensible.
Read the official VCAA curriculum description (VC2M3N06)
These quizzes practise concepts within this topic. Multiple-choice answers alone do not demonstrate drawing, conducting an investigation or using a digital tool.
Activities to practise beyond the quiz
- Supported by the guided activity; selecting an MCQ does not demonstrate this action.
- VC2M3N06-C01Use a nearby benchmark.
- VC2M3N06-C02Combine rounded estimates.
- VC2M3N06-C03Judge reasonableness and estimation error.
- VC2M3N06-C04Estimate an actual collection and explain the reasonableness of a result in context
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Subskills
These practice subskills map to the curriculum topic. Guided activities cover skills beyond multiple-choice questions.
Descriptor-derived subskills
- D01Use a nearby benchmarkUse a nearby benchmark.
- D02Combine rounded estimatesCombine rounded estimates.
- D03Judge reasonableness and estimation errorJudge reasonableness and estimation error.