http://www.mathplayground.com/Decention/Decention.html
http://www.mathplayground.com/ASB_SnowSprint.html
http://www.mathplayground.com/number_conundrum_decimals.html

http://mrnussbaum.com/deathdecimals/
http://mrnussbaum.com/dodgeball/
http://mrnussbaum.com/happy-class/
http://mrnussbaum.com/compcastle/
http://mrnussbaum.com/orderops/