I feel like  having to show work on tests or quizzes are not reasonable. A lot of kids in school have been doing work in their head, and they get in trouble. Kids who want to show work can, but just put the kids computers on lock-down browser so you believe them when they say, "i did it in my head"  because if you don't show your work, so what? it should be optional and have 3 extra points,  that's why showing your work on tests and quizzes should not be  allowed.