If something is missing, I usually use this "short-hand" to explain what it was:
An example: homework is turned in on time with the name only on the first sheet (-1), without work for one of the problems (-1), and one or more problems is missing the statement of the question (-1). This would be graded with "N, W, Q" and worth 1 out of 4 points. If these errors are corrected later, it could only be worth 3 out of 4, since it would then be late.
The best way to consistantly get 4/4 is to finish the homework at the end of the week it is assigned, rather than the week that is it graded.
.Since the lowest 20 point Chapter Test and 10 point quiz each quarter is usually not counted in the overall score, the percentages are NEVER rounded up. I'm already basing your grade on your best work, so the percentage of the best work is used to see (like in the high jump) which letter grade you earned. Therefore, the avererge is converted into letter grades strictly as follows: