Review using known facts and strategies to accurately and efficiently use and check column addition | Maths

Starter quiz

Where will regrouping be needed in this column addition?
- In the tens only
- In the ones only ✓
- In the tens and the ones
- Regrouping will not be needed
Where will regrouping be needed in this column addition?
- In the tens only
- In the ones only
- In the tens and the ones ✓
- Regrouping will not be needed
Jun has started this column addition. Complete it to find the sum.
- '154' ✓
What is the missing digit?
- '9' ✓
What is the missing digit?
- '6' ✓
Look at this calculation. Which two numbers add to equal the sum?
- 243 ✓
- 253
- 263 ✓
- 273

Exit quiz

Which equations will have a sum that is even?
- 444 + 155 =
- 263 + 135 = ✓
- 188 + 234 = ✓
- 337 + 166 =
Which two statements are correct for the column addition shown?
- The ones digit of the sum will be odd. ✓
- The ones digit of the sum will be even.
- The tens digit of the sum will be odd.
- The tens digit of the sum will be even. ✓
Which equations could be efficiently answered using a mental calculation?
- 555 + 199 = ✓
- 367 + 287 =
- 230 + 270 = ✓
- 388 + 165 =
Which calculation is the best one to estimate the sum of 154 + 247?
- 100 + 200
- 150 + 250 ✓
- 160 + 260
- 200 + 300
Alex is trying to calculate the sum of 417 and 296 Which hundreds number will be closest to his answer?
- '700' ✓
Look carefully at Alex’s column addition. Which of these statements about the sum is true?
- The ones digit is incorrect.
- The tens digit is incorrect. ✓
- The hundreds digit is incorrect.
- The sum is correct.

Worksheet

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Lesson Details

Key learning points

Look carefully at the numbers in a calculation. Is column addition the most efficient method to use to find the sum?
Use strategies to help you check your calculations.
Estimate the answer first to improve your accuracy.

Common misconception

Pupils may struggle to use estimation to help them with checking addition equations.

Encourage pupils to find the nearest multiple of 10 or 100 to the numbers they are adding. They will not yet be familiar with ‘rounding’. Estimated answers do not need to be really accurate, then are just an approximation and help when checking.

Keywords

Efficient - Being efficient means finding a way to solve a problem quickly whilst also maintaining accuracy.
Estimation - Estimation means to find a value that is close enough to the right answer, usually with some thought or calculation involved.
Regrouping - The process of unitising and exchanging between place values is known as regrouping.