Use knowledge of column addition and subtraction to calculate with decimals: tenths and hundredths
Lesson details
Learning outcome
I can use knowledge of column addition and subtraction to calculate with decimals with tenths and hundredths.
Key learning points
- Numbers are recorded in columns with the same value digits in each column
- Identify if regrouping will occur
- If the value of a digit in the minuend is greater than the same digit in the subtrahend, you will need to regroup
- Make sure that any regrouped numbers are added in with others of the same value
Keywords
Hundredth - The name we give to one part of one hundred equal parts.
Tenth - The name we give to one part of ten equal parts.
Regroup / regrouping - The process of unitising and exchanging between place values.
Common misconception
Where regroupings are required, pupils may not be concise in their jottings.
Encourage pupils to articulate what each number represents in each calculation, demonstrating the calculations with place value counters.
Teacher tip
Whilst some of the numbers used could be tackled mentally, they have been used to help scaffold thinking as pupils develop their understanding for column methods using decimals. Encourage pupils to reason using place value counters.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Tick all the expressions that would make or bridge 10.
Q2.Order the expressions from the smallest amount to the largest amount.
Q3.Complete the column addition and write in the answer.
Q4.Complete the column subtraction and write in the answer.
Q5.Tick the calculations that require a regrouping.
Q6.Tick the correct explanation of the mistake that has been made.
Assessment exit quiz
6 Questions
Q1.Complete the column addition and write in the answer.
Q2.Complete the column subtraction and write in the answer.
Q3.How many regroupings does this calculation require?
Q4.Which calculation represents this bar model?
Q5.Look at the column addition. What is the missing digit?
Q6.Look at the column subtraction. What is the missing digit?
To help you plan your 5 maths lesson on: Use knowledge of column addition and subtraction to calculate with decimals: tenths and hundredths, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 5 maths lesson on: Use knowledge of column addition and subtraction to calculate with decimals: tenths and hundredths, 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.
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