Year 4 - Maths
Review adding 3-digit numbers using column addition without regrouping
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 add 3-digit numbers using column addition.
Key Notes
- The addends are written in columns with the same value digits in the same column.
- The sum is recorded underneath the addends with the same value digits in the same column.
- Use zero to show that there are no tens or ones in a 3-digit number.
- When using column addition, always start by adding the numbers with the smallest place value first.
Vocabulary To Learn
- Addend: An addend is a number added to another.
- Sum: The sum is the the total when numbers are added together.
- Column addition: Column addition is a way of adding numbers by writing a number below another.
Common Mistakes To Avoid
- When finding missing numbers in column addition, pupils may find it difficult to identify whether they can add or subtract.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
The addends are written in columns with the same value digits in the same column. The sum is recorded underneath the addends with the same value digits in the same column.
2. Use this key word in a maths sentence and explain it clearly. 'Addend'
An addend is a number added to another. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: When finding missing numbers in column addition, pupils may find it difficult to identify whether they can add or subtract. Correction: Remind pupils that addends are parts and the sum is the whole. To find a missing part, we subtract the known part from the whole. To find a missing whole, we add the known parts together. Bar models or part-part-whole models can model this.
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 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 ones 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.