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.

Share activities with pupils
Share function coming soon...

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).

Video

Loading...

6 Questions

Q1.
Where will regrouping be needed in this column addition?
An image in a quiz
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?
An image in a quiz
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.
An image in a quiz
100
110
Correct answer: 120
210
Q4.
What is the missing sum?
An image in a quiz
Correct Answer: 126, one hundred and twenty six
Q5.
What is the missing tens digit?
An image in a quiz
Correct Answer: 1, one
Q6.
What is the missing addend?
An image in a quiz
Correct Answer: 155, one hundred and fifty five

6 Questions

Q1.
What is the missing tens digit in the second addend in the column addition?
An image in a quiz
Correct Answer: 4, four
Q2.
What could the missing digits be in the column addition?
An image in a quiz
Correct answer: 5 and 5
10 and 0
9 and 2
Correct answer: 7 and 3
Q3.
What is the sum of the two numbers?
An image in a quiz
108
118
Correct answer: 128
148
Q4.
What would be a good estimate for the sum of 298 + 305?
400
500
Correct answer: 600
700
Q5.
Which of these calculations would it be more efficient to calculate mentally?
577 + 244
Correct answer: 245 + 99
Correct answer: 240 + 120
364 + 189
Q6.
Which calculations would give an answer between 700 and 800?
505 + 302
Correct answer: 198 + 598
677 + 130
Correct answer: 444 + 333