New
New
Year 3
Subtract from a 2-digit number using column subtraction with regrouping
I can subtract from a 2-digit number using column subtraction with regrouping.
New
New
Year 3
Subtract from a 2-digit number using column subtraction with regrouping
I can subtract from a 2-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.
- Regroup when the ones digit of the subtrahend is greater than the ones digit of the minuend.
- Change the number of ones and tens in the minuend.
Keywords
Column subtraction - Column subtraction is a way of subtracting numbers by writing a number below another.
Regroup - The process of unitising and exchanging between place values is known as regrouping.
Common misconception
Pupils may not understand column subtraction. They may use regrouping without grasping the reasoning behind the algorithm.
Ensure that pupils understand the purpose of regrouping and the value of the numbers when they are using column subtraction. Spend more time using base ten blocks with regrouping if pupils are not ready to progress onto the formal algorithm.
In this lesson, pupils use column subtraction to regroup for calculations where the ones number of the subtrahend is greater than the ones number of the minuend. Take time using base 10 blocks to show this process alongside the written method to support understanding.
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.
Which number in the column subtraction is the minuend?
41
44
Q2.
Which number in the column subtraction is the subtrahend?
44
85
Q3.
Calculate the missing difference using the column subtraction.
14
26
86
Q4.
Calculate the missing difference using the column subtraction.
Q5.
What is the missing tens digit?
Q6.
What is the missing subtrahend?
Exit 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.
37
45
63
Q4.
What is the missing subtrahend?
Q5.
Calculate the difference.
32
38
96
Q6.
What is the missing subtrahend?
