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

  1. Estimate the answer first to improve your accuracy.
  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).

Video

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6 Questions

Q1.
What is the missing tens digit in the second addend in the column addition?
An image in a quiz
Correct Answer: 7, seven
Q2.
What is the missing ones digit in the second addend in the column addition?
An image in a quiz
Correct Answer: 6, six
Q3.
What is the sum of the two numbers?
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105
115
Correct answer: 125
135
Q4.
What would be a good estimate for the sum of 149 + 152?
200
Correct answer: 300
350
400
Q5.
Which of these calculations would it be more efficient to calculate mentally?
648 + 257
435 + 285
Correct answer: 199 + 352
Correct answer: 320 + 120
Q6.
Which calculations will give a sum that is even?
Correct answer: 547 + 325
396 + 207
485 + 352
Correct answer: 764 + 188

6 Questions

Q1.
Estimate the answer to 287 + 109 = Which hundreds number is closest to the answer?
300
Correct answer: 400
500
600
Q2.
Estimate the answer to each calculation. Which have answers close to 800?
Correct answer: 399 + 398
325 + 326
489 + 205
Correct answer: 649 + 152
Q3.
Which calculations will give a sum that is odd?
566 + 328
278 + 456
Correct answer: 742 + 199
Correct answer: 445 + 334
Q4.
Which two of these numbers have a sum of 633?
108
Correct answer: 218
325
Correct answer: 415
Q5.
What is the missing tens digit?
An image in a quiz
Correct Answer: 6, six
Q6.
What is the missing addend?
An image in a quiz
Correct Answer: 153, one hundred and fifty-three