Converting between length units

Convert measurements between metric length units, moving confidently between millimetres, centimetres, metres, and kilometres.

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Learning objective overview

Master Teaching Guide coverage for this objective.

Current NZC (2007)
  • GM4-2
  • GM5-2
New NZC (2026)
  • NZC26-P4-MEA-MEA-P-Y9-02

Resources

  • Alpha textbook: Changing the length units in Ex 21.03, pg 337
  • Alpha textbook: Applying length conversions in Ex 21.04, pg 340
  • CorbettMaths worksheet on converting between unitsQuestions PDF · Answers
  • Beta: Skills in Ex 14.06 & 14.07, pg 269 & 271
  • Beta: Skills in Ex 15.02, pg 282
  • Dr Austin Maths - Converting Units of Area and Volume Practice GridQuestions PDF · Answers

Terminology

  • millimetre (mm)
  • centimetre (cm)
  • metre (m)
  • kilometre (km)
  • conversion factor
  • metric unit

Task goals

  • Recall the metric length conversion facts (10 mm = 1 cm, 100 cm = 1 m, 1000 m = 1 km) and use them to convert in either direction.
  • Convert between millimetres, centimetres, metres, and kilometres, including cases with decimals.
  • Apply unit conversion within a multi-step problem, such as dividing a converted length into equal pieces.
  • Convert lengths across two unit steps (for example km to m to cm) and keep track of place value accurately.

Where this fits

What leads into this objective, and where it goes next.

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Converting between length units

Converting between length units

Do

Selecting and using appropriate measurement units for a given context, converting between metric units if necessary and using appropriate prefixes

Statement▸
Year 9 · Measurement · Measuring
NZC26-P4-MEA-MEA-P-Y9-02

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