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Year 3 · Measurement

Perimeter on a grid

On a 1 cm grid, area is the number of squares inside and perimeter is the number of square edges around the outside.

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How to do it

  1. Area: count whole squares.
  2. Perimeter: count edges all the way round.

Worked example

A 3 by 2 rectangle on the grid
3 + 2 + 3 + 2
Perimeter: 10 cm

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Perimeter counts edges, not squares.

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