Year 3 - Maths
Add 2-digit numbers using column addition
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 add 2-digit numbers using column addition.
Key Notes
- The addends are written in columns with the same value digits in the same column
- Start by adding numbers with the smallest place value first
- Record the sum below the addends
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
- Pupils may refer to adding numbers in the tens as 3 + 6 rather than 30 + 60
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. Start by adding numbers with the smallest place value first.
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: Pupils may refer to adding numbers in the tens as 3 + 6 rather than 30 + 60. Correction: Encourage them to refer to the tens numbers as tens, and use the language appropriately. In 34 + 44, we add 4 and 4 together and then we add 30 and 40 together. This will support their reasoning as they progress in this unit.
More Lessons In This Unit
- 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 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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