Review adding 3-digit numbers using column addition without regrouping | Maths

Starter quiz

What is the sum in this column addition?
- '67' ✓
What ones digit is missing from this column addition?
- '5' ✓
What tens digit is missing from this column addition?
- '3' ✓
Which two addends would make this column addition correct?
- 13 ✓
- 23
- 26 ✓
- 36
Which addend would make this column addition correct?
- '21' ✓
Use the digit cards. Set them out to make two 2-digit numbers. What is the largest sum you can make?
- '95' ✓

Exit quiz

Which expression is represented by the Base 10 blocks?
- 26 + 152
- 116 + 125
- 126 + 152 ✓
- 125 + 162
What is the missing sum in the column addition?
- '766' ✓
What tens digit is missing from this column addition?
- '7' ✓
What hundreds digit is missing from this column addition?
- '2' ✓
What is the missing addend?
- '306' ✓
Use the digit cards. Set them out to make a 3-digit and a 2-digit number. What is the largest sum you can make?
- '573' ✓

Worksheet

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Presentation

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Lesson Details

Key learning points

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.

Common misconception

When finding missing numbers in column addition, pupils may find it difficult to identify whether they can add or subtract.

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.

Keywords

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.