http://www.geocities.com/frischmath/metricsystem.pdf

http://members.aol.com/profchm/metric.html

http://www.sciencemadesimple.net/conversions.html

http://www.worldwidemetric.com/metcal.htm

http://www.tki.org.nz/r/wick_ed/literacy/crossword.php?crossword=32

http://library.thinkquest.org/J002831/quiz.htm

http://www.quia.com/pop/29764.html?AP_rand=87079549

http://www.mrnussbaumgames.com/metric/index.html

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

http://www.aaamath.com/B/mea212x2.htm

http://www.nist.gov/public_affairs/kids/metricpyramidfinal1.pdf

http://ts.nist.gov/WeightsAndMeasures/Metric/lc1136k.cfm#measures

http://library.thinkquest.org/3804/

http://www.hbschool.com/activity/con_math/g05c14.html

http://www.mathleague.com/help/metric/metric.htm

http://www.hbschool.com/activity/elab2004/gr3/23.html

http://www.abcteach.com/Math/usmetr.htm