Working out perimeters by counting squares

Introduced in the Year 3 curriculum as: "Measure the perimeter of simple 2D shapes"

The perimeter of a shape is the distance around the outside.

To work out the perimeter of a rectangle, count how far it is round the outside.

We must always put cm or m as our unit.


Example 1:

This rectangle is 4 along the

top, 2 down, 4 along the

the bottom, then 2 up.

That is a perimeter of 12 cm

altogether.


Example 2:

This rectangle is 5 along the

top, 1 down, 5 along the bottom,

then 1 up.

That is a perimeter of 12 cm

altogether.


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