Year 1 - Maths
Double the numbers 6 to 9 and halve the result explaining what doubling and halving is
Composition of numbers 11 to 19
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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 11-19 as cardinal and ordinal numbers. They will double and halve numbers 6-9 and use addition and subtraction facts to add and subtract within 20.
Lesson Summary
You will learn to double the numbers 6 to 9 and halve the result explaining what doubling and halving is.
Key Notes
- Recall doubling and halving facts to 10
- Doubling the numbers 6-9 gives an even teen number.
- Halving an even teen number gives a number from 6-9
Vocabulary To Learn
- Double: To multiply by 2. To have 2 of something.
- Halve: To divide into two equal parts.
Common Mistakes To Avoid
- If pupils are not more fluent in their doubling facts within 5 they may struggle to efficiently double and halve larger numbers.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Recall doubling and halving facts to 10. Doubling the numbers 6-9 gives an even teen number.
2. Use this key word in a maths sentence and explain it clearly. 'Double'
To multiply by 2. To have 2 of something. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: If pupils are not more fluent in their doubling facts within 5 they may struggle to efficiently double and halve larger numbers. Correction: Provide examples of doubling facts within 5 using representations such as ten frames to support learners.
More Lessons In This Unit
- Explain that the digits in the numbers 11 to 19 express position on a number line Study Guide
- Explain that the digits in the numbers 11 to 19 express quantity Study Guide
- Explore odd and even numbers within 20 Study Guide
- Identify the quantity shown in a representation of numbers 11 to 19 Study Guide
- Solve subtraction problems using knowledge of 10 and a bit Study Guide
- Use knowledge of 10 and a bit to solve problems Study Guide
- Use knowledge of addition and subtraction facts within 10 to add and subtract within 20 Study Guide
- Use knowledge of addition facts within 10 to add within 20 Study Guide
- Use knowledge of subtraction facts within 10 to subtract within 20 Study Guide
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