Flashcards are a great way to learn.
But when studying topics that are more complicated than vocabulary it would be very helpful to be able to write down the answer before checking if it was correct. (For example mathematical derivations). Writing the answer also helps with learning.

My idea is that the flashcard screen shows two flashcards: One with the question (like it already does) and one, that is blank. You can write down your answer in the blank flashcard using the Apple Pencil. When clicking the flashcard with the question it flips over and shows the correct answer, so that you can compare your results and decide if you were correct.

My current workaround is to take a screenshot of the flashcard and write on the screenshot using the iOS markup functionality, but this does not allow you to see your answer and the correct answer side by side.