Estimating / Multiplication and Division with decimal numbers

http://www.ixl.com/math/grade-6/estimate-products-of-decimal-numbers
http://www.playkidsgames.com/games/mathfact/mathFact.htm
http://www.ixl.com/math/grade-6/multiply-decimals

http://www.learnalberta.ca/content/mesg/html/math6web/index.html?page=lessons&lesson=m6lessonshell01.swf
http://www.ixl.com/math/grade-6/divide-decimals-by-whole-numbers