Use column addition to add numbers by regrouping tens

I can use column addition to add numbers by regrouping tens.

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Year 3

Use column addition to add numbers by regrouping tens

I can use column addition to add numbers by regrouping tens.

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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 tens digits is ten or greater, regrouping is needed.
Any complete hundreds are regrouped into the hundreds 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 forget to add the 'regrouped' hundred when calculating the total for the hundreds column.

Model regrouping and finding column totals clearly, reminding pupils to add together all of the numbers in the column to get the total.

Pupils may find base ten blocks helpful at the start of the lesson, especially for understanding the concept of regrouping. Reinforce the idea of starting by adding from the smallest place value first. We do this because of regrouping.