New
New
Year 3

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

I can use known facts and strategies to efficiently calculate and check column addition.

New
New
Year 3

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

I can use known facts and strategies to efficiently calculate and check column addition.

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## Lesson details

### Key learning points

1. Consider each calculation to see whether column addition is the most efficient method to use.
2. Use strategies to help check calculations.
3. 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.

In this lesson, pupils will be comparing column addition with informal, mental methods and considering which strategy they should use. They will also be estimating answers and using other checking strategies.
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.
Where will regrouping be needed in this column addition?
Correct answer: In the ones only.
In the tens only.
In the tens and the ones.
Regrouping will not be needed .
Q2.
Where will regrouping be needed in this column addition?
In the ones only.
In the tens only.
Correct answer: In the tens and the ones.
Regrouping will not be needed.
Q3.
Jun has started this column addition. Complete it to find the sum.
100
110
210
Q4.
What is the missing sum?
Correct Answer: 126, one hundred and twenty six
Q5.
What is the missing tens digit?
Q6.
Correct Answer: 155, one hundred and fifty five

## Exit quiz

### 6 Questions

Q1.
What is the missing tens digit in the second addend in the column addition?
Q2.
What could the missing digits be in the column addition?
10 and 0
9 and 2
Q3.
What is the sum of the two numbers?
108
118
148
Q4.
What would be a good estimate for the sum of 298 + 305?
400
500