Year 4 - Maths
Review using column addition to add 2- and 3-digit numbers by regrouping ones
Review of column addition and subtraction
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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 revisit column addition with regrouping and column subtraction with exchanging to solve problems.
Lesson Summary
You will learn to use column addition including regrouping ones.
Key Notes
- When using column addition, start by adding the numbers with the smallest place value first.
- If the sum of the ones digits is ten or greater, regrouping is needed.
- Any complete tens are regrouped into the tens 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 not regroup ones into the tens 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 ones 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 not regroup ones into the tens column. Correction: Model regrouping from the ones to the tens. Encourage pupils to consider the size of the numbers, thinking about an approximate sum of the two addends. Is their answer reasonable?
More Lessons In This Unit
- Decide on the most efficient subtraction strategy, including column subtraction Study Guide
- Review adding 2-digit numbers using column addition without regrouping Study Guide
- Review adding 3-digit numbers using column addition without regrouping Study Guide
- Review and use knowledge of place value to correctly lay out column addition Study Guide
- Review column addition and identify the addends and sum Study Guide
- Review identifying the minuend and subtrahend in column subtraction Study Guide
- Review using column addition to add 2- and 3-digit numbers by regrouping tens Study Guide
- Review using column addition with regrouping in the ones and tens columns Study Guide
- Review using column subtraction to subtract without regrouping Study Guide
- Review using column subtraction with regrouping from hundreds to tens Study Guide
- Review using column subtraction with regrouping from tens to ones Study Guide
- Review using known facts and strategies to accurately and efficiently use and check column addition Study Guide
- Use column addition to solve problems in different contexts Study Guide
- Use knowledge of column addition to solve problems in a range of contexts Study Guide
Browse all guides in the Year 4 Maths guide library.