Use known facts and strategies to accurately and efficiently calculate and check column addition | Maths

Starter quiz

Where will regrouping be needed in this column addition?

In the ones only. ✓

In the tens only.

In the tens and the ones.

Regrouping will not be needed .
Where will regrouping be needed in this column addition?

In the ones only.

In the tens only.

In the tens and the ones. ✓

Regrouping will not be needed.
Jun has started this column addition. Complete it to find the sum.

100

110

120 ✓

210
What is the missing sum?

'126' ✓
What is the missing tens digit?

'1' ✓
What is the missing addend?

'155' ✓

Exit quiz

What is the missing tens digit in the second addend in the column addition?

'4' ✓
What could the missing digits be in the column addition?

5 and 5 ✓

10 and 0

9 and 2

7 and 3 ✓
What is the sum of the two numbers?

108

118

128 ✓

148
What would be a good estimate for the sum of 298 + 305?

400

500

600 ✓

700
Which of these calculations would it be more efficient to calculate mentally?

577 + 244

245 + 99 ✓

240 + 120 ✓

364 + 189
Which calculations would give an answer between 700 and 800?

505 + 302

198 + 598 ✓

677 + 130

444 + 333 ✓

Worksheet

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Lesson Details

Key learning points

Consider each calculation to see whether column addition is the most efficient method to use.
Use strategies to help check calculations.
Use estimation to give a value close to the correct answer.

Common misconception

Pupils may struggle with estimation, especially with thinking of numbers that are quick and easy to calculate with.

Pupils will probably have little or no experience of rounding but they will be able to think about the place value of numbers and give tens or hundreds numbers that are close. Number lines may be helpful for some children.

Keywords

Efficient - Being efficient means finding a way to solve a problem quickly whilst also maintaining accuracy.
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.