A sk Dr. Math . This site maintains a bank of favorite problems and an archive or previously answered questions searchable by topic or grade level. Biographies of Women Mathematicians. A searchable database of women in mathematics. This site offers a problem a week that is guaranteed to make a student think.
Site provides hints and solutions.
Cornell Theory Center Math and Science Gateway. Excellent site for links to math information and resources. Eisenhower Clearinghouse for Math and Science. A collection of educational resources for K-12 math and science education. Helping Your Child Learn Math.