Explain that addition is commutative
I can explain that if the order of the addends is changed, the sum remains the same.
Explain that addition is commutative
I can explain that if the order of the addends is changed, the sum remains the same.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- When the order of the addends is changed, the sum remains the same.
- Addition is commutative because the addends can be combined in any order.
- An equation can be written to show that when the order of the addends is changed, they remain equal.
Keywords
Addend - part - Any of the numbers that are added together. A part of the whole.
Sum - whole - The result of adding two or more numbers.
Commutative - Addition is commutative because if order of the addends are change, the sum remains the same.
Altogether - To bring two or more numbers together and find out how many. The amount in the whole set or group.
Common misconception
Children may not recognise the same equation when the order of the addends is swapped. They may also think of the equal sign as meaning' the answer is' rather than showing equivalence.
Demonstrate writing equation in different order to that seen in picture or present as mistake to discuss. Refer to equals sign as ‘is equals to’ rather than ‘makes’ or ‘is’ and vary its position in equations to draw attention to its meaning.
To help you plan your year 1 maths lesson on: Explain that addition is commutative, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 1 maths lesson on: Explain that addition is commutative, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 1 maths lessons from the Addition and subtraction facts within 10 unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
1 + 8 = 9
0 + 4 = 4
2 + 7 = 9
