Year 1 - Maths
Explain that addition is commutative
Addition and subtraction facts within 10
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will explain that addition is commutative. They will find pairs of numbers to 10 and add or subtract 1 from any number. Pupils will also develop their knowledge and understanding of odd and even numbers and that even numbers relate to doubling and halving.
Lesson Summary
You will learn to explain that if the order of the addends is changed, the sum remains the same.
Key Notes
- 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.
Vocabulary To Learn
- 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 Mistakes To Avoid
- 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.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
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.
2. Use this key word in a maths sentence and explain it clearly. 'Addend - part'
Any of the numbers that are added together. A part of the whole. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: 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. Correction: 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.
More Lessons In This Unit
- Add and subtract one from any number Study Guide
- Add and subtract two from even numbers within 10 Study Guide
- Add and subtract two from odd numbers within 10 Study Guide
- Addition and subtraction facts within 10 Study Guide
- Addition and subtraction involving zero Study Guide
- Double numbers and explain what doubling means Study Guide
- Explain the difference between consecutive even numbers Study Guide
- Explain the difference between consecutive odd numbers Study Guide
- Find pairs of numbers that sum to 10 Study Guide
- Find the difference between consecutive numbers Study Guide
- Halve numbers and explain what halving means Study Guide
- Solve problems by adding 3 to 5 and 6 Study Guide
- Use knowledge of doubles to calculate near-doubles Study Guide
- Use number pairs to 10 in subtraction contexts Study Guide
Browse all guides in the Year 1 Maths guide library.