Know that perimeter is measured in units of length and can be found by counting or measuring units

I know that perimeter is measured in units of length and can be found by counting or measuring units.

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Year 4

Know that perimeter is measured in units of length and can be found by counting or measuring units

I know that perimeter is measured in units of length and can be found by counting or measuring units.

Download all resources

Share activities with pupils

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Lesson details

Key learning points

Perimeter is measured in units of length.
Perimeter can be counted if shapes are presented on squared paper.
Perimeter can be measured using a ruler.

Keywords

Perimeter - The distance around a two-dimensional shape.
Unit - The unit of one of something that defines the 'one' you are counting in.

Common misconception

Pupils may count a side twice, or miss a side, if they do not remember where their starting point was on the shape when counting the perimeter.

Encourage pupils to mark a starting point, or use dots to mark the units they have counted.

Pictures of number blocks, and pictures of leaves, are provided. However, nothing is better than pupils having hands on experiences using manipulatives so if you are able to access these in real life, please do.

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).