Use knowledge of column addition to solve problems in a range of contexts
Lesson details
Learning outcome
I can use column addition with regrouping to solve problems.
Key learning points
- Estimation gives you a value close to the correct answer.
- Start with the digits with the smallest place value so that regrouping can be represented.
- Look carefully at the ones number of the sum to find missing addends.
Keywords
Estimate - Estimation means to find a value that is close enough to the right answer, usually with some thought or calculation involved.
Regroup - The process of unitising and exchanging between place values is known as regrouping.
Common misconception
Pupils may not make very accurate estimates for their calculations.
This lesson explores inaccurate estimations. Estimations should be quick and easy to calculate, but when adding two addends, it's sensible to make one larger and one smaller so that the estimate is as accurate as possible.
Teacher tip
This lesson encourages pupils to use estimation to help them think about the reasonableness of their answers. They also use the ones digits to choose two addends that add to make a sum. Pupils should be encouraged to use trial and improvement and learn from their mistakes.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Where will regrouping be needed in this column addition?
Q2.What is the missing sum?
Q3.What is the missing digit in this column addition?
Q4.What would be a good estimate for the sum of 189 + 217?
Q5.Which of these calculations would it be more efficient to calculate mentally?
Q6.Which pairs of addends give a sum between 500 and 600?
Assessment exit quiz
6 Questions
Q1.Each of Enzo the elephant’s tusks are 315 cm long. Which would be the most accurate estimate for the length of both of his tusks?
Q2.Each of Enzo the elephant’s tusks are 315 cm long. What is the total length of both of his tusks? cm.
Q3.Eddie the elephant is 347 cm tall. With his trunk, he can reach an extra 148 cm upwards. How far can he reach altogether? Eddie can reach cm.
Q4.Which calculation is the best one to estimate the sum of 459 + 289?
Q5.Look carefully at Alex’s column addition. Which of these statements about the sum is true?
Q6.Eva and baby Elliott have a total length of 585 cm. Choose the correct lengths for Eva and her baby.
To help you plan your 4 maths lesson on: Use knowledge of column addition to solve problems in a range of contexts, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 4 maths lesson on: Use knowledge of column addition to solve problems in a range of contexts, 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.