New
New
Year 3
Subtract from a 3-digit number using column subtraction with regrouping
I can subtract from a 3-digit number using column subtraction with regrouping.
New
New
Year 3
Subtract from a 3-digit number using column subtraction with regrouping
I can subtract from a 3-digit number using column subtraction with regrouping.
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Lesson details
Key learning points
- Start with the numbers with the smallest place value first.
- Regroup when the ones or tens digit of the subtrahend is greater than the ones or tens digit of the minuend.
- If the tens digit of the minuend is a zero, a hundred is regrouped before a ten is regrouped.
Keywords
Column subtraction - Column subtraction is a way of subtracting numbers by writing a number below another.
Regrouping - The process of unitising and exchanging between place values is known as regrouping.
Common misconception
Pupils may struggle to regroup in the ones and tens when the tens digit is zero.
Explain that pupils may need to regroup from the hundreds first, and then regroup in the ones. They still need to start with the numbers with the smallest place value. When crossing out, pupils need to cross out the '10' tens and replace with 9
Pupils will need to have some familiarity with subtracting from 2-digit numbers, including regrouping in the ones. Pupils may need more experience of regrouping with base ten blocks or other manipulatives before moving onto the column subtraction algorithm.
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.
A ten has been regrouped into 10 ones. What number is represented by the base ten blocks?
Q2.
In which of these calculations would you need to regroup?
Q3.
Calculate the difference.
54
64
70
Q4.
What is the missing subtrahend?
Q5.
Calculate the difference.
12
22
92
Q6.
What is the missing subtrahend?
Exit quiz
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6 Questions
Q1.
Where is regrouping needed in the column subtraction?
In the tens
In the ones and tens
Regrouping is not needed
Q2.
Where is regrouping needed in the column subtraction?
In the ones
In the tens
Regrouping is not needed
Q3.
Finish the column subtraction. What is the difference?
Q4.
Finish the column subtraction. What is the difference?
Q5.
What is the difference?
257
357
333
Q6.
What is the difference?
