Why would you ask “How is this possible” when you expect the answer to be “it’s not”?

Because these “teacher is dumber than a child” pictures are always fake. I’ve never seen a teacher write corrections on a student’s paper. Are they doing that for every wrong question on every paper? That would take forever!

You can’t teach if you don’t identify where the students are getting things wrong and correct them. It’s one of the major reasons why teachers deserve so much more pay. My wife used to be a teacher, and she worked 2-3 hours past the end of school correcting students’ work pretty much every weekday, and spent several hours every weekend planning out her lessons for the following week. She got paid significantly less than me working in a basic entry-level 9-5 office position.