extend geometric patterns.

http://www.beaconlearningcenter.com/WebLessons/BrendasBedroom/default.htm

http://www.shodor.org/interactivate/activities/PatternGenerator/?

version=1.5.0_04&browser=MSIE&vendor=Sun_Microsystems_Inc.

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

http://pbskids.org/cyberchase/webisode_1/web_1game.html

http://teams.lacoe.edu/documentation/classrooms/linda/algebra/activities/pattern_grow/pattern_farm.html