「算數學」在英文裡的說法是 do math. It can refer to basic arithmetic as well as solving math problems. For example, after doing the math, I realized that buying a new car would cost less than having my old car fixed.
把「他搬去和父母同住」講成 He moved to live with his parents. 也是將中文直譯的中式英文。英文中要表達「搬去(某人家)和某人住」,是用片語「move in with 某人」。比如:She moved in with her boyfriend. (她搬去和男友同居。)