New
New
Use column addition to add numbers by regrouping tens
I can use column addition to add numbers by regrouping tens.
Lesson 7 of 10
New
New
- Year 3
Use column addition to add numbers by regrouping tens
I can use column addition to add numbers by regrouping tens.
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.
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.How many tens are equal to 130?
How many tens are equal to 130?
3
10
130
Q2.70 + 70 =
70 + 70 =
Q3.Calculate the missing sum using column addition.
Calculate the missing sum using column addition.
Q4.Calculate the missing sum using column addition.
Calculate the missing sum using column addition.
Q5.What is the value of the digit 7 in this column addition?
What is the value of the digit 7 in this column addition?
Q6.What number is missing from this column addition?
What number is missing from this column addition?
Assessment exit quiz
6 Questions
Q1.150 can be regrouped into…
150 can be regrouped into…
1 ten and 5 hundreds
1 ten and 50 ones
1 hundred and 5 ones
Q2.Match each tens numbers to the correct regrouping.
Match each tens numbers to the correct regrouping.
Q3.Calculate the missing sum.
Calculate the missing sum.
217
107
67
Q4.What tens digit is missing from this column addition?
What tens digit is missing from this column addition?
Q5.What is the missing tens digit?
What is the missing tens digit?
Q6.What is the missing tens digit?
What is the missing tens digit?
