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Ask Dr. Math
K-12 math students can submit a math question that volunteer "doctors" will answer via e-mail throughout the day during the academic year. A searchable archive is arranged by grade level.
Biographies of Women Mathematicians
Brief biographies of women mathematicians, some with pictures, presented in alphabetical and chronological formats.
Khan Academy
The Khan Academy is a non-profit organization that offers 1000+ videos on YouTube covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance .
Provides math tables from the simplest to most complex branches of the field. There are also related links including an English-Spanish Math Dictionary.
Mathematical MacTutor's History of Mathematics
Searchable indexes to biographies, history topics, and famous curves. Also graphic chronologies, birthplace maps, mathematicians of the day, and anniversaries for the year.
If you are stumped by word problems involving percents, this site can help. Simply select the word problem form which resembles your problem, fill in the blanks, and click "Solve."
Wolfram MathWorld
Comprehensive mathematics encyclopedia intended for students, educators, math enthusiasts, and researchers. Search by keyword, subject or alphabetically.

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