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Year 1 - Maths

Ordering numbers 11- 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 numbers 11-20 practically.

Key Notes

  • Understand numbers to 20 in the ordinal context, as part of a number track or line.
  • Use the language of first second and third to order numbers and sets of objects to 20.

Vocabulary To Learn

  • first: The smallest of the values.
  • second: The middle value of a set of three.
  • third: The largest of the values.

Common Mistakes To Avoid

  • You can't compare and order numbers that are not next to each other in the counting sequence.

3 Quick Questions (With Answers)

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

Understand numbers to 20 in the ordinal context, as part of a number track or line. Use the language of first second and third to order numbers and sets of objects to 20.

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

The smallest of the values. 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't compare and order numbers that are not next to each other in the counting sequence. Correction: Start with numbers close together in the counting sequence and move on to numbers with a larger gap.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.