My late wife was a math prodigy, in fact she was a very high functioning savant. She earned dual PhDs in math and physics from Purdue at an age so young I won't post it. Suffice it to say she was a real life (female) Good Will Hunting. True mathematicians are born not made. They produce such large amounts of new, original and advanced material, that "mere mortals" can spend centuries trying to understand and absorb their life's work.
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Math was not my best subject, however, as my wife told me "You are living proof that anyone who can count, can learn basic and even some advanced math."
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I'm agnostic but she often said "Mathematics is the language of the universe - It is God's true language." While I disagree with Professor Rubel that math, the universe and God are "racist", I will grant that some teachers and methods are more effective than others. Despite my wife's phenomenal abilities, trying to instruct "normaloids" like me, frustrated her. She was a scientist, not a teacher.
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As has been stated, the best approach is an early and sustained focus on math by talented, dedicated Teachers. Parents must provide a safe and stable environment. With these conditions met, IME the level of any average student's proficiency and advancement, is limited only by how hard and long they are willing to work.