Grades Poster

Here is a poster I have near my student mailboxes.  It explicitly shows my grading scale. 

Also, make note that a "check plus" is not the highest homework grade in my class.  A perfect score on homework is a "plus."  This system allows me to represent the full spectrum of grades (A through F) for short homework assignments. 

I find that this poster helps all of my students accurately judge their work.  It eliminates questions and confusion.  I even find myself referring to it when converting percentages to letter grades.