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Divisibility Rules
This site provides information and examples on divisibility rules.
http://forum.swarthmore.edu/dr.math/faq/faq.divisi...

Classification of Triangles
Learn about triangles, the classification of triangles,types of triangles and more...
http://nyu.edu/classes/murfin/studentprojects/...

Converting Fraction, Decimals and Percents
This site explains how to convert, fraction to decimals to percents.
http://forum.swarthmore.edu/dr.math/faq/faq.fracti...

Math Problems of the Week
Math problems of the Week for each month of the year. There is one problem a week, for both grades 3 and 4's and grades 5 and 6's.
http://mbnet.mb.ca/~jfinch/math.html

Classification of Polygons
http://nyu.edu/classes/murfin/studentprojects/...

Math Forum Elementary POW - Current & Past Problems
Elementary math problem of the week.
http://forum.swarthmore.edu/sum95/ruth/elem.pow.pr...

Dave's Math Tables
A comprehensive selection of math reference tables
http://sisweb.com/math/tables.htm

The Prime Page
http://primes.utm.edu/index.html

Math Problems of the Week
Math problems of the Week for each month of the year. There is one problem a week, for both grades 3 and 4's and grades 5 and 6's
http://mbnet.mb.ca/~jfinch/math.html

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