Subtract from a 2-digit number using column subtraction with regrouping
Lesson details
Learning outcome
I can subtract from a 2-digit number using column subtraction with regrouping.
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.
Teacher tip
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.
Licence
Lesson video
Loading...
Prior knowledge starter quiz
6 Questions
Q1.Which number in the column subtraction is the minuend?
Q2.Which number in the column subtraction is the subtrahend?
Q3.Calculate the missing difference using the column subtraction.
Q4.Calculate the missing difference using the column subtraction.
Q5.What is the missing tens digit?
Q6.What is the missing subtrahend?
Assessment exit quiz
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.
Q4.What is the missing subtrahend?
Q5.Calculate the difference.
Q6.What is the missing subtrahend?
To help you plan your 3 maths lesson on: Subtract from a 2-digit number using column subtraction with regrouping, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 3 maths lesson on: Subtract from a 2-digit number using column subtraction with regrouping, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 2 maths lessons from the Column subtraction unit, dive into the full primary maths curriculum, or learn more about lesson planning.