In science, mathematics, engineering, and statistics courses, some tests will require you to solve problems and show all the steps that led to the solution. Even if you know a shortcut, it is important to document how you got from step A to step B. For these tests, you must also be careful to avoid errors in your scientific notation. A misplaced sign, parenthesis, or bracket can make all the difference.

If you are allowed to use a calculator during the exam, it is important to check that your input is accurate. The calculator does what you tell it to, and if you miss a zero or a negative sign, the calculator will not give you the correct answer to the problem.

Read all directions carefully. Whenever possible, after you complete the problem, work it in reverse to check your solution. Also check to make sure that your solution makes sense. You can’t have negative bushels of apples, for example, or a fraction of a person, or a correlation less than negative 1 or greater than 1.