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7Stones tutorials, games, and simulations of mathematical ideas in science.	Ask Dr. Math a question and answer service for K-12 math students and their teachers.
Cálculo 21 Creado por el profesor Juan Beltrán de Colombia, que tiene el gran mérito de presentar ejercicios resueltos paso a paso	CTK Exchange a place to ask and answer math-related questions.
Deberesmatemáticas.com Contenidos para estudiantes, profesores y colegios.
Ecuaciones.com Respuestas a ejercicios de matemáticas, química y física publicados en libros universitarios.
Jim Loy"s Mathematics Page facts and problems for algebra, geometry, calculus, arithmetic, number theory, and more.
MathNerds offers help on grade school to college level math questions by live mathematicians. Large archive of answered questions and collection of detailed solutions.
Teacher2Teacher an educational question-and-answer service for teachers and parents who have questions about teaching math.
WebMath solves math problems online with step-by-step solutions.