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Resources
Math Dictionary great math dictionary
Harcourt Math Dictionary grades K - 8
Number Theory Interactive Tools National Library of Online Tools.
Ask Dr. Math Answers to hundreds of math questions. Also, if you ask a question, they will answer you!
Math League Help A resource for students, covering all topics. Offers tutorials and definitions for many topics.
Drexel University Math Forum Great site for Kids who like math. Weekly problems. You can submit your answers and mentors answer your submissions. If you pay for a mentor, they will always answer your submission and score it for you.
Tools by Marco Polo Lots of tools to investigate
National Library of Virtual Manipulatives Online Interactive Tolls for all mathematical areas.