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.

Lesson details

Key learning points

  1. Start with the numbers with the smallest place value.
  2. Regroup when the ones digit of the subtrahend is greater than the ones digit of the minuend.
  3. Change the number of ones and tens in the minuend.

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.

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.

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).

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6 Questions

Q1.
Which number in the column subtraction is the minuend?
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41
44
Correct answer: 85
Q2.
Which number in the column subtraction is the subtrahend?
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Correct answer: 41
44
85
Q3.
Calculate the missing difference using the column subtraction.
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14
Correct answer: 24
26
86
Q4.
Calculate the missing difference using the column subtraction.
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Correct Answer: 134, one hundred and thirty-four
Q5.
What is the missing tens digit?
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Correct Answer: 2, two
Q6.
What is the missing subtrahend?
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Correct Answer: 232, two hundred and thirty-two

6 Questions

Q1.
A ten has been regrouped into 10 ones. What number is represented by the base ten blocks?
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Correct Answer: 44, forty-four
Q2.
In which of these calculations would you need to regroup?
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Correct Answer: An image in a quiz
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Correct Answer: An image in a quiz
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Q3.
Calculate the difference.
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37
45
Correct answer: 47
63
Q4.
What is the missing subtrahend?
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Correct Answer: 8, eight
Q5.
Calculate the difference.
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Correct answer: 28
32
38
96
Q6.
What is the missing subtrahend?
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Correct Answer: 16, 16