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
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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
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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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