Year 1 - Maths
Halve numbers and explain what halving means
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 halve numbers and explain what halving means.
Key Notes
- Halving is the inverse of doubling.
- Halving can be used to subtract a number from its double.
Vocabulary To Learn
- Half: One of two equal parts of a whole.
- Halving: To divide into two equal parts.
- Doubling: To become twice as many.
- Inverse: The opposite in effect.
Common Mistakes To Avoid
- Children may struggle to see that halving is the inverse of doubling.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Halving is the inverse of doubling. Halving can be used to subtract a number from its double.
2. Use this key word in a maths sentence and explain it clearly. 'Half'
One of two equal parts of a 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 struggle to see that halving is the inverse of doubling. Correction: Only progress to this lesson once children are fluent in doubling numbers zero to five. Present the same visual (e.g. 3 apples + 3 apples) and use this to discuss doubling and halving, revealing and covering one of the two equal parts each time.
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 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
- 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.