New

New

Year 1

# Finding the missing number from 0 to 20

You can find the missing number from 0 to 20.

New

New

Year 1

# Finding the missing number from 0 to 20

You can find the missing number from 0 to 20.

## Lesson details

### Key learning points

- Use knowledge of stable order principle to figure out missing numbers on a number track.
- Use knowledge of one more than and one less than to work out missing numbers in number tracks.

### Common misconception

Not being secure with the order of the numbers from 11 to 20 when not starting at 0 or 1.

Practice counting starting from different points within 11 to 20 and model the first 3 to establish a pattern.

### Keywords

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.

Be aware of the commonly missed numbers by your pupils and choose missing numbers which target other numbers to secure understanding before targeting the weaker areas in order to give more practice and increase confidence.

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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## Starter quiz

Download starter quiz

### 6 Questions

Q1.

Match the number to complete the sentence

12

12

19

19

Q2.

Match the sentence to the number

11

14

16

10

Q3.

Which bead string shows 1 less than 15?

The top one

Neither

Q4.

Which bead string shows 1 more than 18?

The bottom one

Q5.

What number is 1 more than 15?

Q6.

What number is 1 less than 7?

## Exit quiz

Download exit quiz

### 6 Questions

Q1.

If one of three counting cards is 15, what might the cards be?

16, 17, 18

Q2.

If one of three counting cards is 10, what might the cards be?

7, 8, 9

Q3.

If one of three counting cards is 17, what might the cards be?

14, 15, 16

Q4.

You are counting up to 20. Which numbers come after 14 on these cards?

14 and 15

16 and 17

15 and 17

Q5.

You are counting back from 20 to zero. Which numbers come before and after 18?

17 and 19

19 and 20

17 and 16

Q6.

You are counting up from 0 to 20. Which two numbers will you say before 11?

8 and 9

8 and 10

10 and 11

## Additional material

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