Year 3 - Maths
Use column addition to add numbers by regrouping 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 to add numbers by regrouping tens.
Key Notes
- When using column addition, start by adding the numbers with the smallest place value first.
- If the sum of the tens digits is ten or greater, regrouping is needed.
- Any complete hundreds are regrouped into 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 add the 'regrouped' hundred when calculating the total for the hundreds column.
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. If the sum of the tens digits is ten or greater, regrouping is needed.
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 add the 'regrouped' hundred when calculating the total for the hundreds column. Correction: Model regrouping and finding column totals clearly, reminding pupils to add together all of the numbers in the column to get the total.
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 solve problems Study Guide
- Use column addition with regrouping in ones and tens 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
Browse all guides in the Year 3 Maths guide library.