Review using column subtraction with regrouping from hundreds to tens
Lesson details
Learning outcome
I can use column subtraction, including regrouping from the hundreds to tens.
Key learning points
- Regroup when the ones or tens digit of the subtrahend is greater than the ones or tens digit of the minuend.
- Regroup a ten into 10 ones.
- Regroup a hundred into 10 tens.
- If the tens digit of the minuend is a zero, you need to regroup the hundreds before you can regroup the tens.
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 think regrouping is needed if the tens are the same digit, but regrouping in the ones can mean regrouping in the tens.
Share examples where regrouping 1 ten as 10 tens means that regrouping is also needed in the tens (e.g. 345 - 148).
Teacher tip
Pupils may need to see several examples using Base 10 blocks where there is regrouping in both the tens and the ones. Ensure that pupils refer to the size of the digits when they are using column subtraction. Does the 6 represent 6 ones, 6 tens or 6 hundreds?
Licence
Lesson video
Loading...
Prior knowledge starter quiz
6 Questions
Q1.Which calculations need regrouping from the tens to the ones?
Q2.Complete the column subtraction. What is the difference between the two numbers?
Q3.Complete the column subtraction. What is the difference between the two numbers?
Q4.Find the missing difference in the column subtraction.
Q5.Find the missing ones digit in the column subtraction.
Q6.Find the missing ones digit in the column subtraction.
Assessment exit quiz
6 Questions
Q1.Where is regrouping needed in this column subtraction?
Q2.Where is regrouping needed in this column subtraction?
Q3.Complete the column subtraction. What is the difference between the two numbers?
Q4.Calculate the difference.
Q5.Calculate the difference.
Q6.Calculate the difference.
To help you plan your 4 maths lesson on: Review using column subtraction with regrouping from hundreds to tens, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 4 maths lesson on: Review using column subtraction with regrouping from hundreds to tens, 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 Review of column addition and subtraction unit, dive into the full primary maths curriculum, or learn more about lesson planning.