Study Hub

Study Guides

This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.

Back to Study HubBrowse Year 1 Maths Guides

Year 1 - Maths

Finding one more and one less using representations

Counting to and from 20

Unit Summary

In this unit pupils will consolidate counting to 20 and back They will secure their understanding of the teens numbers in a cardinal and an ordinal context.

Lesson Summary

You can find one more or one less using representations.

Key Notes

  • Secure understanding of one more/one less using a variety of manipulatives .
  • Use the stem sentence one more than... one less than...
  • Identify a missing number in a sequence.

Vocabulary To Learn

  • one more: The next number in the count is one more than the number before and there will be one more object in the set.
  • one less: The previous number in the count is one less than the next number and there will be one fewer object in the set.

Common Mistakes To Avoid

  • Getting numbers in the wrong order when completing the stem sentences with one more and one less.

3 Quick Questions (With Answers)

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

Secure understanding of one more/one less using a variety of manipulatives . Use the stem sentence one more than... one less than...

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

The next number in the count is one more than the number before and there will be one more object in the set. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Getting numbers in the wrong order when completing the stem sentences with one more and one less. Correction: Use the representations to identify and support understanding of which value is one less and which is one more.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.