There is plenty of ambiguity in the common math notation, and it's not limited just to arithmetic. Some of the worst ambiguities are in calculus. If we wanted

There is plenty of ambiguity in the common math notation, and it's not limited just to arithmetic. Some of the worst ambiguities are in calculus. If we wanted to, we could teach a notation that is completely unambiguous. Consider (* (/ 6 2) (+ 1 2)) instead.