Review using column addition to add 2- and 3-digit numbers by regrouping ones

I can use column addition including regrouping ones.

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Year 4

Review using column addition to add 2- and 3-digit numbers by regrouping ones

I can use column addition including regrouping ones.

Download all resources

Share activities with pupils

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Lesson details

Key learning points

When using column addition, start by adding the numbers with the smallest place value first.
If the sum of the ones digits is ten or greater, regrouping is needed.
Any complete tens are regrouped into the tens column.

Keywords

Column addition - Column addition is a way of adding numbers by writing a number below another.
Regroup - The process of unitising and exchanging between place values is known as regrouping.

Common misconception

Pupils may not regroup ones into the tens column.

Model regrouping from the ones to the tens. Encourage pupils to consider the size of the numbers, thinking about an approximate sum of the two addends. Is their answer reasonable?

In this lesson, pupils review their understanding of regrouping in the ones when using column addition. Encourage them to approximate the sum of the two addends and use the digits to work out possible addends when given a sum (e.g. if the sum has a ones digit of 7, what could the addends be?)