Year 3 Mathematics · AC9M3M01

Identify which metric units are used to measure everyday items; use measurements of familiar items and known units to make estimates

Metric units must match the attribute and size of the item. Familiar benchmarks help make sensible estimates

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Learning goalsSay it simply

Metric units must match the attribute and size of the item. Familiar benchmarks help make sensible estimates.

Learning routine: Identify attribute → Choose unit → Use benchmark → Estimate → Check

Success looks like

  • Identify attributes
  • Choose metric units
  • Use benchmarks
  • Make estimates
  • Check estimates

Success criteria:

  • Identify attributes
  • Choose metric units
  • Use benchmarks
  • Make estimates
  • Check estimates
Key conceptTeach from the board

Key idea: Metric units must match the attribute and size of the item. Familiar benchmarks help make sensible estimates.

Learning routine: Identify attribute → Choose unit → Use benchmark → Estimate → Check

metric unit
a standard unit such as metre, kilogram or litre
attribute
the feature being measured, such as length, mass or capacity
estimate
a sensible measurement made before measuring exactly
Clean visual examplesOne-page board

Clean one-page examples

AC9M3M01 - Identify which metric units are used to measure everyday items; use measurements of familiar items and known units to make estimates
Example 1

door ≈ 2 m desk ≈ 1 m pencil ≈ 15 cm

Example 2

benchmark → estimate → measure → compare

Example 3

Choose an appropriate unit pencil cm room m apple g bag of rice kg cup mL bucket L Choose smaller units for smaller quantities and larger units for larger quantities. Read every label and identify what each quantity or feature represents. Describe the relationship shown by the model. Check that the conclusion answers the original question.

Example 4

Estimate from a familiar benchmark door ≈ 2 m desk ≈ 1 m pencil ≈ 15 cm benchmarks support estimates An estimate should use a known measurement, not a random guess. Apply the same relationship to the new context, then justify the answer using the labels and evidence shown.

Curriculum examplesCopied content

The content description and elaborations below show the curriculum ideas taught in this unit. Items marked as teaching context support lesson planning.

  • Content description: identify which metric units are used to measure everyday items; use measurements of familiar items and known units to make estimates
  • E1: examining the packaging on supermarket items to determine the metric unit used to describe the mass or capacity of the contents
  • E2: identifying items that have a mass of one kilogram or 500 grams, or a capacity of one litre or 500 millilitres and using these benchmarks to estimate the mass or capacity of other things, explaining their reasoning
  • E3: estimating the height of a tree by comparing it to the height of their friend and quoting the result as “the tree is about 3 times as tall”; estimating the capacity of a fish tank by using a litre milk carton as a benchmark
  • E4: choosing and using metres to estimate the dimensions of the classroom

Australian, Victorian and NSW alignment retained from the previous page

RegionCurriculumClosest mapping
AustraliaAustralian Curriculum v9.0AC9M3M01 — identify which metric units are used to measure everyday items; use measurements of familiar items and known units to make estimates
VictoriaVictorian Curriculum F-10Year 3 Maths: closest match in Measurement. Use this page as a VIC-aligned practice and worksheet reference.
NSWNSW CurriculumStage 2 Maths: closest content focus for Identify which metric units are used to measure everyday items; use measurements of familiar items and known units to make estimates and related outcomes.
Questions and answersWith answers
What is the big idea in this topic?
Metric units must match the attribute and size of the item. Familiar benchmarks help make sensible estimates.
What routine should I use?
Identify attribute → Choose unit → Use benchmark → Estimate → Check
How do I know I am ready to move on?
You can identify attributes, choose metric units, use benchmarks, make estimates, check estimates and explain how your model or calculation supports the answer.
Practice and reviewReady for practice
  • Unit does not match attribute — Length, mass and capacity use different units.
  • Large unit for tiny object — Choose a unit that gives a useful number.
  • Estimate without benchmark — Refer to a familiar measured item.

  1. Explain why kilometres are not a useful unit for pencil length.

  2. A student estimates a chair has a mass of 5 m. Explain both errors.

Review hint: Follow the routine “Identify attribute → Choose unit → Use benchmark → Estimate → Check” and use the worked model to check whether your answer is reasonable.

Curriculum alignmentStart here

Metric units must match the attribute and size of the item. Familiar benchmarks help make sensible estimates.

Learning routine: Identify attribute → Choose unit → Use benchmark → Estimate → Check

Success looks like

  • Identify attributes
  • Choose metric units
  • Use benchmarks
  • Make estimates
  • Check estimates

Success criteria:

  • Identify attributes
  • Choose metric units
  • Use benchmarks
  • Make estimates
  • Check estimates
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