Subtract from a 2-digit number using column subtraction with regrouping
I can subtract from a 2-digit number using column subtraction with regrouping.
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
- 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.
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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