Metric System activities and tutorials
http://www.wisc-online.com/objects/ViewObject.aspx?ID=ABM4202
http://www.wisc-online.com/objects/ViewObject.aspx?ID=ABM4402
http://www.ixl.com/math/practice/grade-8-convert-rates-and-measurements-metric-units
http://www.funbrain.com/measure/ (3 choices – easy, medium, hard)
http://www.quia.com/rr/30535.html?AP_rand=1382901690
http://www.math4children.com/Grade6/quizzes/metric_system/Metric%20system/index.html