Math is mostly about memorizing the formulas. Once you spend time memorizing the forumulas, which often means having time to practice them over and over again so they get programed into your brain, it's not as hard to do the math involved with the formulas.

When you are trying to learn anything and have a presence around you that is threatening and can trigger your amygdala to get too active, then it interfers with the frontal lobe's ability to concentrate which is needed in learning. So if you have a teacher that has a horrible attitude that upsets your amygdala, then you go home and face more confrontation by being hit etc., that will leave someone with an over active amygdala everytime they try to learn that specific area be it math, reading, writing, whatever. Without realizing it you are actually using math constantly so it's not like you can't really learn it.

Also, NOW we know that some individuals need to learn differently depending on how their brain is wired. Doesn't mean the person is stupid, some actually may even have a genuis IQ.