You may have used a slide rule in the past but here are two free iPad apps that make it easy to score test and quizzes. Groovy Grader provide a percentage based on the number of questions on an exam. eGrader HD will even assign a letter grade depending on the number of questions a student answers correctly. Here are two more teacher tools that I love: Pick a Student and QuickVoice.
Monica Burns is an Author, Speaker, Curriculum & EdTech Consultant and Apple Distinguished Educator. Visit her site ClassTechTips.com for more ideas on how to become a tech-savvy teacher.