New
New
Year 1

Find missing numbers between 20 and 100

I can use a range of strategies to help find missing numbers on a number track.

New
New
Year 1

Find missing numbers between 20 and 100

I can use a range of strategies to help find missing numbers on a number track.

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Lesson details

Key learning points

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

Common misconception

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

Encourage and model how to visualise numbers using the numbers that can be seen.

Keywords

  • 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.

Focus on finding missing numbers using the patterns within a decade as practised in learning cycle one, before moving on to use of decade numbers to help position missing numbers when you don't know the decade.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Video

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6 Questions

Q1.
Aisha is counting forwards, she says 26. What number will she say next?
An image in a quiz
28
25
Correct answer: 27
Q2.
When the numbers become less, you know you are counting __________.
An image in a quiz
forwards
Correct answer: backwards
Q3.
Sort these numbers in the order you would say if counting forwards.
1 - 60
2 - 61
3 - 62
4 - 63
Q4.
Sort these numbers in the order you would say them if counting backwards.
1 - 93
2 - 92
3 - 91
4 - 90
Q5.
Lucas is thinking of a number in the seventies. Use the clue he gives to work out the number.
An image in a quiz
76
Correct answer: 79
80
Q6.
Match the numbers to the correct decade.
Correct Answer:the forties,47

47

Correct Answer:the fifties,56

56

Correct Answer:the sixties,65

65

Correct Answer:the seventies,74

74

6 Questions

Q1.
Complete the following: 6 is __________ the number 7.
Correct answer: before
after
between
Q2.
Which of these numbers is between 30 and 40 on the number track?
An image in a quiz
27
Correct answer: 37
47
Q3.
Complete the stem sentence. I know that the number after 3 is 4 so I know that the number after 23 is .
Correct Answer: 24, twenty four
Q4.
Match the numbers to the correct number that comes before it on a number track
Correct Answer:47,46

46

Correct Answer:49,48

48

Correct Answer:51,50

50

Q5.
Use the patterns within the decade to help you complete the following. The number after 23 is 24, so the number after 33 is ___..
An image in a quiz
Correct answer: 34
32
22
Q6.
Use the patterns on the number tracks to help you find out the number before 38.
An image in a quiz
39
Correct answer: 37