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Long time ago, when I was a kid, math was my favorite subject, but everything had changed when I went to high school, math became my disaster totally. Complex equations, algebra, pre-calculus，AP Calculus and various other branches of mathematics is so hard for me that my math grades always embarrass me. I guess all over the world math is regarded as the most difficult subject to understand. Maybe you and your friends, or even your kids and your friends’ kids may also face problems in learning math at his school or college.