Year 1 - Maths
Use knowledge of doubles to calculate near-doubles
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 use knowledge of doubles to calculate near-doubles.
Key Notes
- Knowing double facts helps you to calculate near-doubles.
- If 2 + 2 is equal to 4, then 2 + 3 is equal to one more than 4 which is 5
Vocabulary To Learn
- Double: To become twice as many.
- Near-double: A near-double is a number close to a double.
- Addends: Any of the numbers that are added together.
Common Mistakes To Avoid
- Children could try to apply this idea to other near-double facts that may be more easily solved using other strategies.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Knowing double facts helps you to calculate near-doubles. If 2 + 2 is equal to 4, then 2 + 3 is equal to one more than 4 which is 5.
2. Use this key word in a maths sentence and explain it clearly. 'Double'
To become twice as many. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children could try to apply this idea to other near-double facts that may be more easily solved using other strategies. Correction: 0 + 1 and 1 + 2 are near-doubles, but these are more easily solved using the 'one more'/ 'one less' strategy. Explore this together before leading children to the most efficient strategy for calculating.
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
- Halve numbers and explain what halving means Study Guide
- Solve problems by adding 3 to 5 and 6 Study Guide
- Use number pairs to 10 in subtraction contexts Study Guide
Browse all guides in the Year 1 Maths guide library.