Suppose you have a book on the counter. You look down at the last page and conclude the book has 307 pages. How many sheets are in the book? Jargon Alert: The number of "sheets" is the number of "leaves" or physical pieces of paper that are bound to make the book. Remember that each sheet or each piece of paper has both a front side and a backside. Only include the numerical portion in the answer box (just type in the whole number of sheets, else the answer (even if correct) will be counted as incorrect.