What is the hardest thing about learning Mandarin?
Tones. Unlike most languages, Mandarin requires a perfection in speaking that is only accomplished through doing and practice. Saying a word in one way may mean something completely different if said in another.
What constitutes "Basic Math"?
Basic Math consists of the core fundamentals in understanding and learning math. This includes addition, subtraction, multiplication, and division. This leads to higher-level and more sophisticated mathematical subjects including Geometry, Algebra, Trigonometry, Calculus, and beyond.