Year 5 Mathematics · AC9M5M01

Choose appropriate metric units when measuring the length, mass and capacity of objects; use smaller units or a combination of units to obtain a more accurate measure

Students select a metric unit and instrument that produce a useful precision, use familiar benchmarks to estimate and convert related units before comparing measurements

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Learning goalsSay it simply

Students select a metric unit and instrument that produce a useful precision, use familiar benchmarks to estimate and convert related units before comparing measurements.

A suitable measurement choice matches the attribute, expected size and precision required by the purpose.

Choose the smaller unit when finer precision is needed and a larger unit when the quantity would otherwise require an unwieldy number.

Convert only where it helps comparison. Record units, instrument precision and whether an estimate is reasonable.

Learning routine: Represent → Reason → Calculate → Interpret → Verify

Success looks like

  • Represent accurately
  • Explain the relationship
  • Choose a suitable method or unit
  • Apply in context
  • Check and justify
Key conceptTeach from the board

Match attributes, units, instruments and benchmarks

attributeunitinstrumentbenchmarkpencil lengthmm or cmrulerabout 15 cmroom lengthmtapedoor about 2 mapple massgbalanceabout 150 gwater bottle capacitymLmeasuring jugabout 600 mLair temperature°Cthermometerroom about 20°C

Choose the smaller unit when finer precision is needed and a larger unit when the quantity would otherwise require an unwieldy number.

  1. Read every label and identify the quantities, parts or evidence.
  2. Explain the relationship shown—not just the final answer.
  3. Check the conclusion against the original question and units.

Estimate, measure and compare in common units

comparisoncommon form1.25 m vs 118 cm125 cm > 118 cm2.4 kg vs 2 350 g2 400 g > 2 350 g1.5 L vs 1 480 mL1 500 mL > 1 480 mL18°C vs 24°C24°C is 6°C warmer

Convert only where it helps comparison. Record units, instrument precision and whether an estimate is reasonable.

Now transfer the same relationship to a new situation and justify the result with precise vocabulary.

Clean visual examplesOne-page board

Clean one-page examples

AC9M5M01 - Choose appropriate metric units when measuring the length, mass and capacity of objects; use smaller units or a combination of units to obtain a more accurate measure
Example 1

attribute unit instrument benchmark pencil length mm or cm ruler about 15 cm room length m tape door about 2 m apple mass g balance about 150 g water bottle capacity mL measuring jug about 600 mL air temperature °C thermometer room about 20°C

Example 2

comparison common form 1.25 m vs 118 cm 125 cm > 118 cm 2.4 kg vs 2 350 g 2 400 g > 2 350 g 1.5 L vs 1 480 mL 1 500 mL > 1 480 mL 18°C vs 24°C 24°C is 6°C warmer

Example 3

attribute unit instrument benchmark pencil length mm or cm ruler about 15 cm room length m tape door about 2 m apple mass g balance about 150 g water bottle capacity mL measuring jug about 600 mL air temperature °C thermometer room about 20°C

Example 4

comparison common form 1.25 m vs 118 cm 125 cm > 118 cm 2.4 kg vs 2 350 g 2 400 g > 2 350 g 1.5 L vs 1 480 mL 1 500 mL > 1 480 mL 18°C vs 24°C 24°C is 6°C warmer

Curriculum examplesCopied content

Content description: choose appropriate metric units when measuring the length, mass and capacity of objects; use smaller units or a combination of units to obtain a more accurate measure.

  • E1: ordering metric units from the largest unit to the smallest; for example, kilometre, metre, centimetre, millimetre
  • E2: recognising that some units of measurement are better suited to some tasks than others; for example, kilometres are more appropriate than metres to measure the distance between 2 towns
  • E3: deciding on the unit required to estimate the amount of paint or carpet for a room or a whole building; justifying the choice of unit in relation to the context and the degree of accuracy required
  • E4: measuring and comparing distances, such as jumps or throws using a metre length of string; for example, then measuring the part metre with centimetres and/or millimetres; explaining which unit of measure is most accurate
  • E5: researching how the base units are derived for the International System of Units (SI), commonly known as the metric system of units, recognising that the metric unit names for the attributes, length and mass are international standards for measurement
Questions and answersWith answers

Core idea: A suitable measurement choice matches the attribute, expected size and precision required by the purpose.

Remember

  • Represent accurately
  • Explain the relationship
  • Choose a suitable method or unit
  • Apply in context
  • Check and justify

Important questions

  • Choose a unit for desk length. Explain using the model or evidence above.
  • Estimate a 2 kg object. Explain using the model or evidence above.
  • Compare 1.25 m and 118 cm. Explain using the model or evidence above.
  • Choose an instrument for capacity. Explain using the model or evidence above.
  • Explain precision. Explain using the model or evidence above.
Practice and reviewReady for practice
  • Unit chosen from object name rather than attribute — One object can have length, mass, capacity and temperature.
  • Largest unit assumed most accurate — Precision depends on scale and purpose.
  • Different units compared directly — Convert to a common unit.
  • Estimate has no benchmark — Reference a known measurement or grouping.

Learn from the Topic Guide and fixed Teacher Slides, complete the Practice Sheet, use Practice for supported feedback, then take the Test when ready.

Curriculum alignmentStart here

Students select a metric unit and instrument that produce a useful precision, use familiar benchmarks to estimate and convert related units before comparing measurements.

A suitable measurement choice matches the attribute, expected size and precision required by the purpose.

Choose the smaller unit when finer precision is needed and a larger unit when the quantity would otherwise require an unwieldy number.

Convert only where it helps comparison. Record units, instrument precision and whether an estimate is reasonable.

Learning routine: Represent → Reason → Calculate → Interpret → Verify

Success looks like

  • Represent accurately
  • Explain the relationship
  • Choose a suitable method or unit
  • Apply in context
  • Check and justify
Related resourcesKeep teaching

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