Standard 5 · SEA Mathematics

Perimeter Formulae

Use the formulae for the perimeter of rectangles and squares, then find the perimeter of shapes with corners cut out and work out a missing side. Each exercise marks itself as your child goes, explains the answer, and awards stars.

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What your child practises

Skills in this topic

Perimeter of a rectanglePerimeter of a squarePerimeter of shapes with corners cut outFinding a missing side from the perimeter

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6 free exercises in this topic

Match the shape

Fill the gap

Complete the table

SEA style challenge

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Steps and two parts

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How an exercise works

SEA practice app: Exercises inside a topic — Exercises inside a topic

SEA practice app: Instant feedback on every answer — Instant feedback on every answer

SEA practice app: Stars, ranks and badges — Stars, ranks and badges

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