Use knowledge of column addition and subtraction to calculate with decimals: tenths and hundredths

I can use knowledge of column addition and subtraction to calculate with decimals with tenths and hundredths.

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Year 5

Use knowledge of column addition and subtraction to calculate with decimals: tenths and hundredths

I can use knowledge of column addition and subtraction to calculate with decimals with tenths and hundredths.

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Share activities with pupils

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Lesson details

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

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.

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.

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.

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Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).