Ordering Decimals –
http://cemc2.math.uwaterloo.ca/mathfrog/english/kidz/orderdecimal6.shtml
http://www.wmnet.org.uk/resources/gordon/Higher%20And%20Lower%20-%20Reveal%20and%20Order%20v6.swf
Rounding Decimals –
http://www.topmarks.co.uk/Flash.aspx?f=DartboardRoundingv2
http://www.transum.org/software/SW/Starter_of_the_day/Students/RoundingDP.asp

Thomas
Love doing the halving it was easy i will do some from the links you left us!