# Make efficient use of subtraction strategies including column subtraction

I can make efficient use of subtraction strategies including column subtraction.

# Make efficient use of subtraction strategies including column subtraction

I can make efficient use of subtraction strategies including column subtraction.

## Slide deck

## Lesson details

### Key learning points

- A mental strategy may be more efficient than a column method
- Look carefully at the numbers in a calculation to decide a method
- Column subtraction might be the most efficient method to use if regrouping is needed

### Common misconception

Pupils may think that column subtraction is always the most efficient strategy where regrouping is needed.

Emphasise calculations where adjustment is the most efficient strategy (e.g. 456 - 199). Regrouping is needed in both the tens and hundreds, but is is not the most efficient strategy.

### 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.

Regrouping - The process of unitising and exchanging between place values is known as regrouping.

### 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).

## Video

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