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Year 3 - Maths

Compare unit fractions by looking at the denominator

Compare and order unit fractions

Unit Summary

In this unit pupils will compare and order unit fractions by looking at the denominator and understanding what it represents.

Lesson Summary

You will learn to compare unit fractions by looking at the denominator.

Key Notes

  • When the whole is the same, the greater the number of equal parts, the smaller each equal part is.
  • When the whole is the same, the smaller the number of equal parts, the larger each equal part is.
  • When comparing unit fractions, the greater the denominator, the smaller the fraction.
  • When comparing unit fractions, the smaller the denominator, the larger the fraction.

Vocabulary To Learn

  • Whole: The whole is all of a group or number.
  • Part: A part is a section of the whole.
  • Denominator: A denominator is the bottom number in a fraction. It shows how many equal parts a whole has been divided into.
  • Unit fraction: A unit fraction is a fraction where the numerator is 1

Common Mistakes To Avoid

  • Children often believe that the greater the denominator the bigger the fraction.

3 Quick Questions (With Answers)

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

When the whole is the same, the greater the number of equal parts, the smaller each equal part is. When the whole is the same, the smaller the number of equal parts, the larger each equal part is.

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

The whole is all of a group or number. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Children often believe that the greater the denominator the bigger the fraction. Correction: Reinforce this using the fraction wall. Constantly refer back to it and ensure that the children become experts at using it as a tool for comparison.

More Lessons In This Unit

Browse all guides in the Year 3 Maths guide library.