Nuclear Reaction Worksheet Answers Key. A worksheet, in the word’s original meaning, is usually a sheet of paper on which one performs work. It’s a printed page a child finishes using a writing instrument. No additional materials are needed. It’s”a sheet of paper on which workouts, working time, special instructions, etc. are recorded. A piece or scrap of paper on which problems, thoughts, or the like, are put down in tentative form.” In education, a worksheet could have questions for pupils and places to record answers. In accounting, a worksheet is, or was, a sheet of ruled paper with rows and columns on which an accountant could record data or perform calculations.