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).

## Starter quiz

### 6 Questions

Q1.
Aisha is counting forwards, she says 26. What number will she say next?
28
25
Q2.
When the numbers become less, you know you are counting __________.
forwards
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.
76
80
Q6.
Match the numbers to the correct decade.

47

56

65

74

## Exit quiz

### 6 Questions

Q1.
Complete the following: 6 is __________ the number 7.
after
between
Q2.
Which of these numbers is between 30 and 40 on the number track?
27
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

46

48