Review using column addition to add 2- and 3-digit numbers by regrouping tens
Lesson details
Learning outcome
I can use column addition to add numbers by regrouping tens.
Key learning points
- When using column addition, start by adding the numbers with the smallest place value first.
- If the sum of the tens digits is ten or greater, regrouping is needed.
- Any complete hundreds are regrouped into the hundreds column.
Keywords
Column addition - Column addition is a way of adding 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 struggle to present regrouping in column addition.
Encourage pupils to talk about the process as they work through the problems. Model this in the lesson e.g. '5 tens add 7 tens is equal to 12 tens. 10 tens are regrouped as 1 hundred and written in the hundreds column.'
Teacher tip
Some pupils may benefit from using Base 10 blocks for at least part of this lesson. This can reinforce the size of the numbers and help pupils to grasp the concept of regrouping. Number cards may also be helpful in the problem solving tasks in the second cycle of the lesson.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is the sum in this column addition?
Q2.In which column addition calculations do you need to regroup in the ones?
Q3.What is the sum in the column addition?
Q4.What is the sum in the column addition?
Q5.Which ones digit is missing from this column addition?
Q6.Which ones digit is missing from this column addition?
Assessment exit quiz
6 Questions
Q1.In which column addition calculations do you need to regroup in the tens?
Q2.What is the sum in the column addition?
Q3.What is the sum in the column addition?
Q4.Which tens digit is missing from this column addition?
Q5.Which tens digit is missing from this column addition?
Q6.Match up the 2-digit numbers so that each pair has a sum of 125
To help you plan your 4 maths lesson on: Review using column addition to add 2- and 3-digit numbers by regrouping 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 addition to add 2- and 3-digit numbers by regrouping 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.