Review adding 3-digit numbers using column addition without regrouping

I can add 3-digit numbers using column addition.

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Year 4

Review adding 3-digit numbers using column addition without regrouping

I can add 3-digit numbers using column addition.

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Share activities with pupils

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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.

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.

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.

Ensure that pupils understand that digits have to be set out in the correct columns if they are to represent the value of a given number. Because regrouping has not yet been revisited, challenge thinking using missing digits and targeting a number using digit cards.