True, but this is something so basic any teacher should be able to figure it out, regardless of how long it's been since they've been in a classroom. Ideally, this is something any high school student should be able to answer.
Even then - teachers are not Degreed on all subjects. You have Math, English, History, etc.
Yes, but they should have basic knowlege over all of the major subjects. I wouldn't necessarily expect every teacher to know how to work with i for example, but they should all be able to handle basic fractions.
Then you have the specific Education 'Level' the teacher is Degreed for. Like Elementary K-3, 4-8 or Secondary (High School).
Also true, but adding fractions is something that is taught at one of the lower levels. One would expect teachers of all levels to know something that basic.
...However, ask her about "1066" or "The Battle of Hastings" and you get a blank stare. I know more about History that she does. But that doesn't mean I'm smarter and would be a better teacher, or that she's a bad teacher.
Of course. But suppose you asked your friend who FDR was, or to name the civilization that ruled the Western world in the time of Christ. I'd say that's about on par with asking an English teacher, or a teacher's union president, to add two small fractions. If your friend couldn't answer those questions, would you start to have some doubts about her?
Would 'commie traitor' be a correct answer?
However you bring up a point about my teacher friend. When we used to play Trivial Pursuit (waaaaaaaaay back when) she stunk. The FDR question may stump her, but I'm sure she'd get the Roman Empire.