Review adding 2-digit numbers using column addition without regrouping

I can add 2-digit numbers using column addition.

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Year 4

Review adding 2-digit numbers using column addition without regrouping

I can add 2-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.
Start by adding the numbers with the smallest place value first.
Record the sum below the addends.
To find a missing part, subtract the known part from the whole.

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

Pupils may refer to adding numbers in the tens as 3 + 6 rather than 3 tens + 6 tens or 30 + 60

Encourage pupils to refer to the tens numbers as tens. In 34 + 44, we add 4 ones and 4 ones together, and then we add 3 tens and 4 tens together. This will support pupil's understanding as they progress to addition with regrouping.

Ensure that pupils start by adding numbers with the smallest place value first. Avoid saying 'start with the ones' or 'start on the right' as in upper KS2, there will be column addition with decimal numbers.