In your K-12 years

[Bacon King]

I used Ms., Mrs., or Mr. when addressing my teachers directly, unless I had a nickname they were okay with. When talking about them to someone else I just used last names.

[patrick1]

In grammar school, it was always "Ms." or "Mrs." depending on if they were married, naturally.  But I suppose when spoken most kids would say "Ms. Valentino" rather than "Mrs. Valentino" out of laziness.  Nuns were always simply "Sister".

In high school, it was the same, with a few exceptions.  Father Mascietto was "Father Mosh".  Brother O'Connell was "O.C."  And Brother Wright (my French teacher) was "Frere". 

Out of curiosity, where did you go? Farrell, Moore, St Joseph?

Monsignor Farrell.  You from Staten Island?

No, I went to Catholic High School on LI (Kellenberg) and we played you in Football.   Sadly/Admittedly, most of my exposure to SI has been driving to and playing games at Farrell.

[muon2]

I called the single ones Miss and the married ones Mrs., (in other words, whatever the hell they told us to call them on the first day of class).  There is no other way to do it.

^^^

[MaxQue]

First Name. Strangely, many were angry when called Madame/Monsieur (Mrs/Mr).

[ilikeverin]

Did you refer to all of your female teachers as "Miss (last name)", or did you refer to certain teachers as "Mrs. (last name)" or some other prefix?

Almost always "Ms.".  Frequently even if I knew that they were a "Miss" or a "Mrs.".

[muon2]

Did you refer to all of your female teachers as "Miss (last name)", or did you refer to certain teachers as "Mrs. (last name)" or some other prefix?

Almost always "Ms.".  Frequently even if I knew that they were a "Miss" or a "Mrs.".

When I introduce women in public I almost always use Ms now. That wasn't an option when I was in school however.

[ilikeverin]

Did you refer to all of your female teachers as "Miss (last name)", or did you refer to certain teachers as "Mrs. (last name)" or some other prefix?

Almost always "Ms.".  Frequently even if I knew that they were a "Miss" or a "Mrs.".

When I introduce women in public I almost always use Ms now. That wasn't an option when I was in school however.

Thank goodness for linguistic evolution, I suppose