One of the longest running math resource areas on the Internet! This is the first place I go for questions my students ask me about Math that stump me.
If your students do stump you with a math question, go the Ask Dr. Math feature. There’s a Frequently Asked Question section dealing with such classic questions as: Which is more, a million dollars or a penny doubled every day? What question should the princess ask the natives to find out the right road to take? Let's Make a Deal: If you're shown a goat behind the second door, should you stay with your first choice or switch? Other questions deal with dividing by zero, a negative times a negative, order or operations, pi, square roots without a calculator. If you can’t find the answer in the FAQ, then you can submit your question to Dr. Math.
Discussion groups housing thousands of math questions, an Internet Newsletter, Math Tools, Problems of the Week, Teacher2Teacher, (a resource for teachers and parents who have questions about teaching mathematics), Teacher Exchange (contains lessons for Pre-K to College), Workshops and an Internet Mathematics Library are all designed to support the teaching of math in the classroom.
Still more support materials can be found in the Math Resources by Subject, Math Education and Key Issues in Math.
If you still can’t find what you need, head over to the search engine. It’s a very practical tool that not only searches the Math Forum site, but will also send your query to other search engines as well.
I like this site for its simplicity and ease of finding those sometimes elusive math resources. A great first place to head for math resources and answers.