Year 1 - Maths
Add and subtract one from any number
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 add and subtract one from any number.
Key Notes
- Adding one gives one more.
- Subtracting one gives one less.
Vocabulary To Learn
- One more: The number after a given number is one more than it.
- One less: The number before a given number is one less than it
Common Mistakes To Avoid
- Children may struggle to count on from, or back from, a given number.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Adding one gives one more. Subtracting one gives one less.
2. Use this key word in a maths sentence and explain it clearly. 'One more'
The number after a given number is one more than it. 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 struggle to count on from, or back from, a given number. Correction: Encourage automaticity with the counting sequence through regular practice. At times, pause so that children need to predict the number that is one more/less. Initially, you may need to model silently counting from one through to the given number.
More Lessons In This Unit
- 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 that addition is commutative 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.