Hugs to your DS. It's always sad when their enthusiasm in a subject is not matched by the teacher's.

The grade may simply be not following directions or irritation/laziness on the teacher's part that she has to take the extra few minutes to review your DS' work. I am not a teacher, but I have to confess that I have criticized adults for wasting my time with two page explanations when I requested a couple of short answers to incorporate into a document.

Originally Posted by Kai
I have told my children again and again that the correct answer--when the correct answer is being determined by another person--is the answer that that person thinks is correct.

This notion has served them well, particularly on standardized tests.

ITA with this.