New
New
Year 3

Use column addition with regrouping in ones and tens

I can use column addition with regrouping in the ones and tens.

New
New
Year 3

Use column addition with regrouping in ones and tens

I can use column addition with regrouping in the ones and tens.

Lesson details

Key learning points

  1. When using column addition, start by adding the numbers with the smallest place value first.
  2. Make sure that any regrouped 10s are added with the values in the tens column.
  3. Make sure that any regrouped 100s are added with the values in the hundreds column.

Common misconception

Pupils may forget to refer to the size of the numbers when adding and when regrouping.

Encourage pupils to talk about the place value of the digits. Ten ones can be regrouped as a ten; ten tens can be regrouped as a hundred.

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.

Pupils will need some familiarity regrouping ones and tens with column addition up to 3-digits. Sets of number cards (2-7) will be helpful for the second part of the lesson.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
170 can be regrouped into…
1 ten and 7 hundreds
1 ten and 70 ones
1 hundred and 7 ones
Correct answer: 1 hundred and 7 tens
Q2.
9 + 8 =
Correct Answer: 17, seventeen
Q3.
What number is missing from this column addition?
An image in a quiz
Correct Answer: 4, four
Q4.
What is the sum of the two numbers?
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126
143
Correct answer: 146
166
Q5.
What number is missing from this column addition?
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Correct Answer: 7, seven
Q6.
What tens digit is missing from this column addition?
An image in a quiz
Correct Answer: 9, nine

6 Questions

Q1.
Where will regrouping be needed in this column addition?
An image in a quiz
Correct answer: In the tens only
In the ones only
In the tens and the ones
Regrouping will not be needed
Q2.
Where will regrouping be needed in this column addition?
An image in a quiz
In the tens only
In the ones only
Correct answer: In the tens and the ones
Regrouping will not be needed
Q3.
Jun has started this column addition. Complete it to find the sum.
An image in a quiz
Correct Answer: 154, one hundred and fifty four
Q4.
The same digit is missing from both boxes. What is the number?
An image in a quiz
Correct Answer: 9, nine
Q5.
What is the missing tens digit?
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Correct Answer: 7, seven
Q6.
What is the missing sum?
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Correct Answer: 521