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Year 1 - Maths

Comparing and ordering numbers 0-20 practically

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 and order the numbers 0-20 practically.

Key Notes

  • Highlight language such as 15 is more than 10.
  • What number comes before or is one less than 14?
  • Which number comes after or is one more than 14?

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

  • You can compare numbers that are more than one apart and say which numbers are one more or one less.

3 Quick Questions (With Answers)

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

Highlight language such as 15 is more than 10. What number comes before or is one less than 14?

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: You can compare numbers that are more than one apart and say which numbers are one more or one less. Correction: Make it clear whether pupils are comparing numbers or whether they are giving the values that are one more and one less.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.