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Year 1 - Maths

Comparing numbers to 20

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 compare groups using the the language 'more than', 'less than', 'fewer than' and 'the same as'.

Key Notes

  • Compare collections of up to 20 items.
  • Use comparative language of more, less and fewer.
  • Introduce the idea of one more and one less.
  • Know that sets of objects can be the same or equal.

Vocabulary To Learn

  • more than: A bigger set has more than a smaller set.
  • less than: A smaller set has less than a larger set.
  • fewer than: A smaller set has fewer than a larger set.
  • the same as: Sets can contain the same as each other having the same number of objects, actions or sounds.
  • equal to: Sets can be equal to each other having the same number of objects, actions or sounds.

Common Mistakes To Avoid

  • Linking one more or one less than a number to the number after or before in the count.

3 Quick Questions (With Answers)

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

Compare collections of up to 20 items. Use comparative language of more, less and fewer.

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

A bigger set has more than a smaller set. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Linking one more or one less than a number to the number after or before in the count. Correction: Use objects to model one more being added or one being removed to show one less or fewer.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.