Perimeter & Area
Shape Builder: http://www.shodor.org/interactivate/activities/ShapeBuilder/
Perimeter & Area: http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html
both http://www.mathplayground.com/area_perimeter.html
Birthday Party: http://www.mathplayground.com/PartyDesigner/PartyDesigner.html
Shape Surveyor: http://www.funbrain.com/poly/
En Garde Dual game: http://math4children.com/Grade3/games/Geometry_surface_area/index.html
Perimeter & Area: http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html
both http://www.mathplayground.com/area_perimeter.html
Birthday Party: http://www.mathplayground.com/PartyDesigner/PartyDesigner.html
Shape Surveyor: http://www.funbrain.com/poly/
En Garde Dual game: http://math4children.com/Grade3/games/Geometry_surface_area/index.html