New
New
Year 3

# Use column addition with regrouping to solve problems

I can use column addition with regrouping to solve problems.

New
New
Year 3

# Use column addition with regrouping to solve problems

I can use column addition with regrouping to solve problems.

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## Lesson details

### Key learning points

2. Start with the numbers with the smallest place value so that regrouping can be represented.
3. Use strategies to check, recognising when the answer should be odd or even.

### Common misconception

Pupils may spend too long trying to make a very accurate estimate for their calculations.

Pupils need to understand that an estimation should be quick and easy to calculate. Encourage them to think about the nearest hundreds numbers so that these can be added together very quickly to give a value close enough to the answer.

### Keywords

• Estimate - Estimation means to find a value that is close enough to the right answer, usually with some thought or calculation involved.

• Regroup - The process of unitising and exchanging between place values is known as regrouping.

Pupils will need to be familiar with regrouping ones and tens numbers when using column addition. For the second cycle in the lesson, the number cards 2-9 would be really useful as pupils can manipulate these to try and make the sums.
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).

## Starter quiz

### 6 Questions

Q1.
What is the missing tens digit in the second addend in the column addition?
Q2.
What is the missing ones digit in the second addend in the column addition?
Q3.
What is the sum of the two numbers?
105
115
135
Q4.
What would be a good estimate for the sum of 149 + 152?
200
350
400
Q5.
Which of these calculations would it be more efficient to calculate mentally?
648 + 257
435 + 285
Q6.
Which calculations will give a sum that is even?
396 + 207
485 + 352

## Exit quiz

### 6 Questions

Q1.
Estimate the answer to 287 + 109 = Which hundreds number is closest to the answer?
300
500
600
Q2.
Estimate the answer to each calculation. Which have answers close to 800?
325 + 326
489 + 205
Q3.
Which calculations will give a sum that is odd?
566 + 328
278 + 456