Decide on the most efficient subtraction strategy, including column subtraction
I can make efficient use of subtraction strategies, including column subtraction.
Decide on the most efficient subtraction strategy, including column subtraction
I can make efficient use of subtraction strategies, including column subtraction.
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Lesson details
Key learning points
- Look carefully at the numbers in a calculation.
- Column subtraction might be the most efficient method to use if regrouping is needed.
- Use a mental strategy where it would be more efficient.
Keywords
Efficient - Being efficient means finding a way to solve a problem quickly whilst also maintaining accuracy.
Mental strategy - A mental strategy is a method chosen to find something out which can be done in your head or with some jottings.
Regroup - The process of unitising and exchanging between place values is known as regrouping.
Common misconception
When using adjustment (e.g. 456 − 199), pupils may forget whether they have to subtract or add 1 after they have subtracted 200
Ask pupils if they subtract 200 then subtract 1 more, how much have they subtracted altogether? They should see that they have subtracted 201, not 199 A number line representation will support pupil's understanding with this.
To help you plan your year 4 maths lesson on: Decide on the most efficient subtraction strategy, including column subtraction, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 4 maths lesson on: Decide on the most efficient subtraction strategy, including column subtraction, download all teaching resources for free and adapt to suit your pupils' needs.
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Explore more key stage 2 maths lessons from the Review of column addition and subtraction unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
