Calculate perimeter of compound shapes

Can be used for Year 4/Year 5 or even Year 6 revision. A worksheet where children will need to calculate missing lengths of compound shapes. They will then answer questions relating to the shapes and finally as a challenge they need to be able to calculate with decimal numbers.
This links to Year 5 objectives: Measure and calculate the perimeter of composite rectilinear shapes in centimetres and metres.
Also Year 4 objectives: Convert between different units of measure. Measure and calculate the perimeter of a rectilinear figure (including squares) in centimetres and metres.