All answers must be justified by supporting work. If you use a calculator to solve a problem, write a sentence explaining your steps. If you use the method of Guess and Test to solve a problem, show your process. Remember, the main objective of this course is not just to do the mathematics and get the correct answers, but to show that you are able to communicate effectively with your students about the problem-solving process. Write up all solutions so that anyone reading your paper would be able to follow the flow of your work.
Organization is important.
Writing should be neat and legible. I will only grade problems that I can read. Write what your mean. Don't expect that others will know what you meant. Your students may not.