AAA Math
Here is a great place for Kindergarten to Grade 8 students to practice their basic facts of addition, subtraction to learning about fractions, place value and graphing. The site is very interactive and easy to use.
http://aaamath.com/index.html

A+Math
This hands on web site is designed to help students with their math skills. It includes Flash Cards, Games Room, and Homework Helper for checking homework and Worksheets. It also has updated math activities in the What's New section.
http://www.aplusmath.com/

A Math Dictionary for Kids
Learning math words or definitions was never this fun before. Math terms are organized alphabetically. Click on the math vocabulary word you want explained. This site gives more than just a definition, it also gives you a chance to practice using the math terms. Flash 5.0 is required to make this interactive web site work.
http://www.teachers.ash.org.au/jeather/maths/dictionary.html

Count On
This site is filled with everything from math stories to games. You will be sure to find something to do here.
http://www.counton.org/

Create-a-Graph
Have you heard the saying: "A picture is worth a thousand words"? Graphs are another way to communicate information visually. Create graphs (area, line, bar and pie) by entering your information into the data boxes. Create-a-graph will create a graph for your use.
http://nces.ed.gov/nceskids/Graphing/

Dositey
Have fun with free interactive lessons, exercises, worksheets, educational games, and open-ended questions in Math and Language Arts.
http://www.dositey.com/

Education Place Brain Teasers
Brain teasers are posted weekly for grade 3/4, 5/6 and 7+ students. Useful for practicing problem solving including helpful hints. Solutions are posted the following week.
http://www.eduplace.com/math/brain/

FunBrain
FunBrain has lots of fun math games for kids to use. Try Math Baseball or Fresh Baked Fractions or any other game under the Math heading.
http://www.funbrain.com

The Math Forum - Student Center
Ask Dr. Math questions you can't understand or search past questions to see if your question has already been answered. Try a Problem of the Week or try some math activities leveled as Elementary, Middle School, High School, College or Graduate.
http://forum.swarthmore.edu/students/

Mathweb.com
A great help in learning how numbers work. A good self-guided tutorial on how to do math for K-8 students.
http://www.webmath.com/index4.html

National Library of Virtual Manipulatives
Math is not a spectator sport. At this library, you are encouraged to touch and move different objects to help you understand math concepts. Math activities for preschool children to grade 12 are included.
http://nlvm.usu.edu/en/nav/vlibrary.html

Online Conversion - convert just about anything to anything
Do you need to convert centimetres to kilometres or miles to kilometres? Here is the site for you. It converts units of measurement easily for you.
http://www.onlineconversion.com

Project Interactive
Try out this interactive web site to explore math concepts. It's filled with activities, lessons, information for elementary students in grades 3 to 5 and discussions.
http://www.shodor.org/interactivate/

Rainforest Maths
This site is filled with interactive math activities to do for Kindergarten to Grade 6 students. Topics cover offer practice in number and number concepts, perations & properties, problem solving, patterns, probability, measurement, and data analysis. Links to a math dictionary.
http://www.rainforestmaths.com/