Calculating Density Worksheet With Answer Key. A worksheet, in the term’s original meaning, is a sheet of paper where one performs work. It is a printed page that a child completes with a writing instrument. No other materials are needed. It’s”a sheet of paper on which work schedules, working time, special instructions, etc. are listed. A piece or scrap of paper about which problems, ideas, or so on, are put down in tentative form.” In schooling, a worksheet may have questions for pupils and places to document answers. In accounting, a worksheet is, or has been, a sheet of ruled paper with columns and rows where an accountant could record data or perform calculations.