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Year 5 - Maths

Convert from larger to smaller units of measure

Converting units

Unit Summary

In this unit pupils will apply memorised unit conversions to convert between units of measure and solve problems involving converting between units of time and money.

Lesson Summary

You will learn to apply known unit conversions to convert from larger to smaller units of measure.

Key Notes

  • 1 m = 1000 mm
  • 1 kg = 1,000 g
  • 1 l = 1,000 ml
  • 1 km = 1,000 m

Vocabulary To Learn

  • Equivalent: When two or more things have the same value.
  • Convert: To change a value or expression from one form to another.

Common Mistakes To Avoid

  • Some pupils may see the prefix 'milli' and think it is related to 'million'.

3 Quick Questions (With Answers)

1. Solve this in steps: explain the method from this lesson and why each step matters.

1 m = 1000 mm. 1 kg = 1,000 g.

2. Use this key word in a maths sentence and explain it clearly. 'Equivalent'

When two or more things have the same value. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Some pupils may see the prefix 'milli' and think it is related to 'million'. Correction: Part of the lesson focuses on the etymology of the words and the fact that the prefix 'milli' means 'thousandth'; a millimetre is a thousandth of a litre and a millilitre is one thousandth of a litre. Consider displaying this in your environment.

More Lessons In This Unit

Browse all guides in the Year 5 Maths guide library.