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 is an excellent introduction to the vertex form of a quadratic function.

http://www.heymath.com/main/samples/us21/teacherstemplate.html

Compete against a friend, the computer or someone from around the world in a tug of war. To win, you have to compare the size of fractions quickly and accurately. Great fun! Note that the game can take quite a while if the competitors are evenly matched!

http://www.arcademicskillbuilders.com/games/dirt-bike-comparing-fraction...

An exciting way to practice creating equivalent fractions. You compete against your mates, the computer or other fraction-maniacs around the world to find equivalent fractions quickly and accurately.

http://arcademicskillbuilders.com/games/dirt-bike-proportions/dirt-bike-...

Ratio Stadium
Ratio Stadium is an additive arcade game in which the players have to find ratios that are equivalent to each other - and do it fast and accurately. Play against friends, against the computer or against other ratio addicts around the world. Addictive and great fun - three thumbs up!
http://arcademicskillbuilders.com/games/ratio-stadium/ratio-stadium.html

Ratio Blaster
Ratio Blaster is a one-person Space Invaders type game. How quickly can you blast the equivalent fractions out of the sky? Three thumbs up!
http://www.arcademicskillbuilders.com/games/ratio-blaster/ratio-blaster....

Compete against friends, against the computer or against players from other parts of the world in a variety of arcade games. To win, you have to answer addition, subtraction, multiplication or division questions quickly and accurately. You can set the range of numbers if you wish. Highly addictive and great fun! Three thumbs up!!

Jet Ski Addition
Can you answer the addition questions faster than your competitors? Only one way to find out!
http://arcademicskillbuilders.com/games/jetski/jetski.html

Island Chase Subtraction
A fun way to practice your subtraction facts.
http://www.arcademicskillbuilders.com/games/island_chase/island_chase.ht...

Multiplication Grand Prix
A car race with a difference. You power your car by answering multiplication questions as accurately and quickly as possible.
http://arcademicskillbuilders.com/games/grand_prix/grand_prix.html

Drag Race Division
The fastest and most accurate divider will win this race! Will it be you?
http://arcademicskillbuilders.com/games/drag_race/drag_race.html

More games can be found at
http://www.arcademicskillbuilders.com/