New
New
Year 4
Use knowledge of column addition to solve problems in a range of contexts
I can use column addition with regrouping to solve problems.
New
New
Year 4
Use knowledge of column addition to solve problems in a range of contexts
I can use column addition with regrouping to solve problems.
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Lesson details
Key learning points
- Estimation gives you a value close to the correct answer.
- Start with the digits with the smallest place value so that regrouping can be represented.
- Look carefully at the ones number of the sum to find missing addends.
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.
Common misconception
Pupils may not make very accurate estimates for their calculations.
This lesson explores inaccurate estimations. Estimations should be quick and easy to calculate, but when adding two addends, it's sensible to make one larger and one smaller so that the estimate is as accurate as possible.
This lesson encourages pupils to use estimation to help them think about the reasonableness of their answers. They also use the ones digits to choose two addends that add to make a sum. Pupils should be encouraged to use trial and improvement and learn from their mistakes.
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).Lesson video
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Starter quiz
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6 Questions
Q1.
Where will regrouping be needed in this column addition?
In the ones only
In the tens and the ones
Regrouping will not be needed
Q2.
What is the missing sum?
Q3.
What is the missing digit in this column addition?
Q4.
What would be a good estimate for the sum of 189 + 217?
200
300
500
Q5.
Which of these calculations would it be more efficient to calculate mentally?
258 + 367
565 + 259
Q6.
Which pairs of addends give a sum between 500 and 600?
317 + 315
505 + 103
Exit quiz
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6 Questions
Q1.
Each of Enzo the elephant’s tusks are 315 cm long. Which would be the most accurate estimate for the length of both of his tusks?
500 cm
700 cm
800 cm
Q2.
Each of Enzo the elephant’s tusks are 315 cm long. What is the total length of both of his tusks? cm.
Q3.
Eddie the elephant is 347 cm tall. With his trunk, he can reach an extra 148 cm upwards. How far can he reach altogether? Eddie can reach cm.
Q4.
Which calculation is the best one to estimate the sum of 459 + 289?
400 + 200
400 + 300
500 + 300
Q5.
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 sum is correct.
Q6.
Eva and baby Elliott have a total length of 585 cm. Choose the correct lengths for Eva and her baby.
Eva is 399 cm long.
Baby Elliott is 176 cm long.
Baby Elliott is 156 cm long.