Using my calculator is different than the way I was taught in school.
Go back to school.
We were taught BEDMAS, brackets, exponents, division, multiplication, addition, subtraction."My dear aunt sally" is a mnemonic phrase used to remember the order of operations in math, standing for "Parentheses, Exponents, Multiplication, Division, Addition, Subtraction" - essentially meaning you should perform calculations in that order when solving a math problem.