New
New
Year 1
Find the difference between consecutive numbers
I can recognise and use consecutive numbers.
New
New
Year 1
Find the difference between consecutive numbers
I can recognise and use consecutive numbers.
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Lesson details
Key learning points
- In a subtraction equation, when the subtrahend is one less than the minuend, all except one is subtracted.
- Numbers that are one more or one less than each other are called consecutive numbers.
- Consecutive numbers have a difference of one.
- Spotting consecutive numbers in subtraction equations can help us to solve equations more quickly.
Keywords
Difference - The result of subtracting one number from another.
One less - The number before a given number is one less than it.
Consecutive - Numbers which follow each other in order, without gaps.
Common misconception
Children may resort to counting strategies to find the difference e.g. counting back four from five to solve 5 - 4
Always make a clear link between 'all except one' object leaving, and the subtrahend being one less than the minuend.
The aim here is for children to recognise the relationship between the minuend and the subtrahend, realising that the difference must be one, rather than resorting to counting-based strategies. Explore 'difference of one' contexts working to 'consecutive numbers have a difference of one'.
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).
Lesson video
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Starter quiz
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6 Questions
Q1.
Match the equation to the total.
6
9
5
10
Q2.
Match the equation to the answer.
2
5
8
6
Q3.
Addition is commutative. Which equations have the same sum?
6 + 1
1 + 9
1 + 3
8 + 2
Q4.
Match the equation to the answer.
9
6
5
8
Q5.
Jacob has one pound. He needs five pounds to buy a new book. How many more pounds does he need?
Q6.
First, Sam has 10 cherries. Then, she eats some of the cherries. Now, she has one cherry left. How many cherries did she eat?
Exit quiz
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6 Questions
Q1.
True or false. 4 and 5 are consecutive numbers.
False
Q2.
4 is the consecutive number before 5 What is the consecutive number after 5?
Q3.
What is the missing subtrahend?
Q4.
What is the missing subtrahend in this equation? 8 - = 1
6
1
Q5.
Which equation shows that consecutive numbers have a difference of 1?
4 + 2 = 6
1 + 5 = 6
6 - 3 = 3
Q6.
I had 6 cakes. Now, there is 1 cake left. How many cakes have been eaten? Which bar model represents this problem?
