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Year 1 - Maths

Finding one more and one less with manipulatives and images

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 and one less with manipulatives and images.

Key Notes

  • Secure understanding of one more and one less using a variety of manipulatives and pictures.
  • Use stem sentences including one more than and one less than.

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

  • Incorrect sequence of counting when recalling the next and previous numbers.

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 and one less using a variety of manipulatives and pictures. Use stem sentences including one more than and 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: Incorrect sequence of counting when recalling the next and previous numbers. Correction: Start with parts of the sequence where pupils are confident to secure the concept of counting on for one more and back for one less.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.