Year 3 - Maths
Use column addition with regrouping in ones and tens
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 in the ones and tens.
Key Notes
- When using column addition, start by adding the numbers with the smallest place value first.
- Make sure that any regrouped 10s are added with the values in the tens column.
- Make sure that any regrouped 100s are added with the values in the hundreds column.
Vocabulary To Learn
- Column addition: Column addition is a way of adding numbers by writing a number below another.
- Regroup: The process of unitising and exchanging between place values is known as regrouping.
Common Mistakes To Avoid
- Pupils may forget to refer to the size of the numbers when adding and when regrouping.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
When using column addition, start by adding the numbers with the smallest place value first. Make sure that any regrouped 10s are added with the values in the tens column.
2. Use this key word in a maths sentence and explain it clearly. 'Column addition'
Column addition is a way of adding numbers by writing a number below another. 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 forget to refer to the size of the numbers when adding and when regrouping. Correction: Encourage pupils to talk about the place value of the digits. Ten ones can be regrouped as a ten; ten tens can be regrouped as a hundred.
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 to solve problems 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
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