Year 3 - Maths
Use column addition with regrouping to solve problems
Column addition
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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 identify the addends and the sum in column addition. They will use their knowledge of place value to correctly lay out column addition.
Lesson Summary
You will learn to use column addition with regrouping to solve problems.
Key Notes
- Estimate the answer first to improve your accuracy.
- Start with the numbers with the smallest place value so that regrouping can be represented.
- Use strategies to check, recognising when the answer should be odd or even.
Vocabulary To Learn
- Estimate: Estimation means to find a value that is close enough to the right answer, usually with some thought or calculation involved.
- Regroup: The process of unitising and exchanging between place values is known as regrouping.
Common Mistakes To Avoid
- Pupils may spend too long trying to make a very accurate estimate for their calculations.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Estimate the answer first to improve your accuracy. Start with the numbers with the smallest place value so that regrouping can be represented.
2. Use this key word in a maths sentence and explain it clearly. 'Estimate'
Estimation means to find a value that is close enough to the right answer, usually with some thought or calculation involved. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may spend too long trying to make a very accurate estimate for their calculations. Correction: Pupils need to understand that an estimation should be quick and easy to calculate. Encourage them to think about the nearest hundreds numbers so that these can be added together very quickly to give a value close enough to the answer.
More Lessons In This Unit
- Add 2-digit numbers using column addition Study Guide
- Add 3-digit numbers using column addition Study Guide
- Identify the addends and the sum in column addition Study Guide
- Use column addition to add numbers by regrouping ones Study Guide
- Use column addition to add numbers by regrouping tens Study Guide
- Use column addition to solve problems Study Guide
- Use column addition with regrouping in ones and tens Study Guide
- Use known facts and strategies to accurately and efficiently calculate and check column addition Study Guide
- Use place value to correctly lay out column addition Study Guide
Browse all guides in the Year 3 Maths guide library.