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Year 1 - Maths

Find missing numbers between 20 and 100

Pattern in counting from 20 to 100

Unit Summary

In this unit pupils will extend their learning by counting to 100. They will explore the pattern in counting and focus on the end of the decade and the start of the new decade numbers. 

Lesson Summary

You will learn to use a range of strategies to help find missing numbers on a number track.

Key Notes

  • You can find missing numbers on number tracks in different ways.
  • You can count forwards or backwards to find a number.
  • You can look at the number before or after the missing number to help find it.
  • You can find missing numbers on a number track by looking at the numbers it comes between.
  • You can use the patterns in numbers to work out new facts.

Vocabulary To Learn

  • after: A number that is after another comes later when you count.
  • before: A number that is before another comes earlier when you count.
  • between: A number that is between two others is in the space that separates them.
  • strategy: A method chosen to find something out.

Common Mistakes To Avoid

  • Difficulty finding missing numbers when more than one number missing is from a number track.

3 Quick Questions (With Answers)

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

You can find missing numbers on number tracks in different ways. You can count forwards or backwards to find a number.

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

A number that is after another comes later when you count. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: Difficulty finding missing numbers when more than one number missing is from a number track. Correction: Encourage and model how to visualise numbers using the numbers that can be seen.

More Lessons In This Unit

Browse all guides in the Year 1 Maths guide library.