Know that the perimeter of a rectangle can be calculated by addition and multiplication

I can calculate the perimeter of a rectangle using addition and multiplication.

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Year 4

Know that the perimeter of a rectangle can be calculated by addition and multiplication

I can calculate the perimeter of a rectangle using addition and multiplication.

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Share activities with pupils

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Lesson details

Key learning points

To calculate the perimeter of a rectangle you can double the lengths of the shorter and longer sides and add the values.
To calculate the perimeter of a rectangle you can add one long and one short side and double the total.
Mental and written methods can be used to calculate the perimeter of a 2D shape.

Common misconception

Pupils may not realise that, even when one of the long side and short side lengths is missing in a rectangle, they still have enough information as these are the same as the given lengths.

Counters are encouraged in this unit. It may be that some pupils still need the missing side lengths written on counters, but as with all scaffolding, this should only be temporary. Ask them - do you need this counter? Do you already know the number?

Keywords

Perimeter - The distance around a two-dimensional shape.
Double - Have two of something.

Doubling is a skill required in this lesson and you may wish to consider how you can practise this prior to using it. Pupils should be fluent in doubling and partitioning within 20 Consider how to support learners who are less fluent.

Teacher tip

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).