I hate grading papers. If you are a teacher, you probably understand. Grading papers ranks up there with folding laundry and dusting. And papers do need to be graded.
So to help with the tedious work, I have been photocopying the assignments on transparencies, , writing the answers above the blank on the transparency, and punching holes next to the answer blanks. I also punch a star in the top corner. If the paper is perfect they get the star gets colored. If the answer is correct, I color on the hole.
Less thinking = less painful=less time = papers get returned.