http://www.crickweb.co.uk/ks2numeracy-money-and-mean.html
http://www.kidsmathgamesonline.com/numbers/.html
http://jmathpage.com/JIMSStatisticspage.html
http://interactivesites.weebly.com/mean-median-and-mode.html
http://www.aasd.k12.wi.us/staff/boldtkatherine/MathResources3-6/Math_MeanMedianModeRange.htm
http://www.technologyrocksseriously.com/2011/04/mean-median-mode-range.html