Year 2 - Maths
Use knowledge of doubling, halving and the 2 times table to solve problems
Multiplying by 2, doubling and halving (factors and products)
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Study Guides
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 learn how multiplication with 2 as a factor relates to doubling and how we can see halving as the inverse of doubling, deriving the related halving fact from a known double.
Lesson Summary
You will learn to use knowledge of doubling, halving and the 2 times table to solve problems.
Key Notes
- Doubling is a multiplication where one of the factors is 2
- When one of the factors is 2, the other factor is half of the product.
- Doubles facts to 5 can help to double and halve 2-digit numbers.
Vocabulary To Learn
- Double / Doubling: To become twice as many / to multiply by two.
- Half / Halving: One of two equal parts of a whole / To divide into two equal parts.
- Check: To evaluate working, ensuring our response provides an answer to the given problem.
Common Mistakes To Avoid
- Children may revert to inefficient strategies to solve problems e.g. counting on, using fingers.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Doubling is a multiplication where one of the factors is 2. When one of the factors is 2, the other factor is half of the product.
2. Use this key word in a maths sentence and explain it clearly. 'Double / Doubling'
To become twice as many / to multiply by two. 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 revert to inefficient strategies to solve problems e.g. counting on, using fingers. Correction: Within the second learning cycle, children are encouraged to evaluate strategies used by others. The most efficient strategies should be discussed together throughout the first learning cycle to support with this.
More Lessons In This Unit
Browse all guides in the Year 2 Maths guide library.