Multiple choice general knowledge math & puzzles What does A.O.S. stand for? Awesome Opac Standing Algerbraic Operating System Algerbra Oppisite Subtraction Acting Out Subtracting Reveal answer Fill a bubble to check yourself B Correct answer Explanation A.O.S. stands for Algebraic Operating System. It is a method used by many calculators to evaluate mathematical expressions by following the order of operations (BODMAS/PEMDAS), unlike RPN (Reverse Polish Notation) which uses a stack-based approach.