A variety of activities based around timelines and duration.
http://www.mathsframe.co.uk/traintimes.swf

Other resources by this author can be found at:
http://www.mathsframe.co.uk/free_resources.asp

A matching game for number facts, decimal and fraction conversions, and measurement conversions.
http://www.mathsframe.co.uk/cardgame.swf

Other resources by this author can be found at:
http://www.mathsframe.co.uk/free_resources.asp

Interactive Area Explorer - Fix the perimeter, and then find the area
http://www.shodor.org/interactivate/activities/AreaExplorer/

Interactive Perimeter Explorer - Fix the area, and then find the perimeter.
http://www.shodor.org/interactivate/activities/PerimeterExplorer/

Interactive Perimeter and Area Explorer - Find both the perimeter and the area of the shape.
http://www.shodor.org/interactivate/activities/ShapeExplorer/

The shapes include compound shapes.

http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perim...

Drag the pieces into the factory and build three spaceships.

http://pbskids.org/cyberchase/games/perimeterarea/perimeterarea.html

Choose to solve problems on perimeter of a rectangle, area of a rectangle or both perimeter and area of a rectangle.

http://www.funbrain.com/poly/index.html

Choose centimetres or inches, and then a level (Easy, Medium, Hard or Super Brain).

http://www.funbrain.com/measure/

Measure the length of the parcel in centimetres, find its mass and decide which size stamp to put on it to mail it.

http://www.bbc.co.uk/schools/ks2bitesize/maths/activities/measures_fs.sh...

This resource attempts to emulate a cell phone calculator. The teacher can demonstrate how to use the simple calculators to do useful real world maths. At the moment 2 types of real world questions can be generated by the resource: percentage discounts and area.

Instructions
http://www.teacherled.com/2009/01/03/cell-phone-maths/

Resource
http://www.teacherled.com/resources/cellphone/cellphoneload.html

There are 2 clocks with minute and hour hands that can be dragged to set a ‘from’ and a ‘to’ time. The time line shows whole hours and 15 minute intervals. You can annotate directly to this using the built in annotation. Using these tools you can demonstrate how to use a time line to calculate how much time there is between 2 given times.

Instructions
http://www.teacherled.com/2008/10/05/elapsed-time-line/

Resource
http://www.teacherled.com/resources/elapsedtime/elapsetimelineload.html