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Year 2 - Maths

Relate finding half of a number to halving and doubling

Fractions: identify equal parts and be familiar with halves, thirds and quarters

Unit Summary

In this unit pupils will identify whether something has or has not been split into equal parts. They will name fractions one-half one-quarter and one-third in relation to a fraction of a length shape or set of objects.

Lesson Summary

You will learn to explain how finding half of a number relates to halving and doubling.

Key Notes

  • To find half of a number you split it into 2 equal parts
  • Use knowledge of doubles and halves to find half of a number
  • If you double the half you will end up with the whole number

Vocabulary To Learn

  • Double: To become twice as many.
  • Half: To divide into 2 equal parts.

Common Mistakes To Avoid

  • Children may find it difficult to find the whole when they are told the size of the half and may try to find half of the half.

3 Quick Questions (With Answers)

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

To find half of a number you split it into 2 equal parts. Use knowledge of doubles and halves to find half of a number.

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

To become twice as many. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Children may find it difficult to find the whole when they are told the size of the half and may try to find half of the half. Correction: Use a bar model representation to help children see the structure of double and half. Use gesture, colour and/or circling when discussing what each part of the bar model represents.

More Lessons In This Unit

Browse all guides in the Year 2 Maths guide library.