http://www.glencoe.com/sites/common_assets/mathematics/ebook_assets/vmf/VMFInterface.html This is an online math manipulative website.
http://www.amathsdictionaryforkids.com/ 
An animated, interactive dictionary for students which explains over
500 common mathematical terms in simple language. http://matti.usu.edu/nlvm/nav/vlibrary.html
 This is a great collection of "Virtual Manipulatives"
 interactive, webbased activities or concept tutorials, mostly in the form of Java
applets. http://www.figurethis.org/
 This website's purpose is to "Help families enjoy mathematics outside school through a series of fun and engaging, highquality challenges".
Loads of great math problems. http://www.mathcanbefun.com/times
 How to Learn your Multiplication Facts
http://www.oame.on.ca/CLIPS/  Online Fraction Learning Module
http://www.onlineloancalculator.org/resources/kidscalculationtools.php
 This website has links to some great online calculators.
