Use column addition with regrouping to solve problems | Maths

Starter quiz

What is the missing tens digit in the second addend in the column addition?
- '7' ✓
What is the missing ones digit in the second addend in the column addition?
- '6' ✓
What is the sum of the two numbers?
- 105
- 115
- 125 ✓
- 135
What would be a good estimate for the sum of 149 + 152?
- 200
- 300 ✓
- 350
- 400
Which of these calculations would it be more efficient to calculate mentally?
- 648 + 257
- 435 + 285
- 199 + 352 ✓
- 320 + 120 ✓
Which calculations will give a sum that is even?
- 547 + 325 ✓
- 396 + 207
- 485 + 352
- 764 + 188 ✓

Exit quiz

Estimate the answer to 287 + 109 = Which hundreds number is closest to the answer?
- 300
- 400 ✓
- 500
- 600
Estimate the answer to each calculation. Which have answers close to 800?
- 399 + 398 ✓
- 325 + 326
- 489 + 205
- 649 + 152 ✓
Which calculations will give a sum that is odd?
- 566 + 328
- 278 + 456
- 742 + 199 ✓
- 445 + 334 ✓
Which two of these numbers have a sum of 633?
- 108
- 218 ✓
- 325
- 415 ✓
What is the missing tens digit?
- '6' ✓
What is the missing addend?
- '153' ✓

Worksheet

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Presentation

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Lesson Details

Key learning points

Estimate the answer first to improve your accuracy.
Start with the numbers with the smallest place value so that regrouping can be represented.
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.