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Year 5 - Maths

Convert to and from fraction and decimal quantities of larger units

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 convert to and from fraction and decimal quantities of larger units.

Key Notes

  • 1 mm = 0.001km
  • 1 g = 0.001 kg
  • 1 ml = 0.001 l
  • 1 m = 0.001 km

Vocabulary To Learn

  • Equivalent: If two or more things have the same value, they are equivalent.
  • Convert: Convert means to change a value or expression from one form to another.

Common Mistakes To Avoid

  • Pupils see values like 0.25 l and convert it to 25 ml.

3 Quick Questions (With Answers)

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

1 mm = 0.001km. 1 g = 0.001 kg.

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

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

3. Spot and fix this common maths mistake.

Mistake: Pupils see values like 0.25 l and convert it to 25 ml. Correction: The lesson presents fractions and decimals as parts of whole circles. As long as pupils know that 1 l = 1,000 ml, they should see from the representation that 0.25 l = 250 ml as 250 + 250 + 250 + 250 = 1,000.

More Lessons In This Unit

Browse all guides in the Year 5 Maths guide library.