This document provides a lesson on finding the opposite of a number's opposite. It begins with an opening exercise involving locating numbers and their opposites on a number line. Example problems then walk through finding the opposite of the opposite of specific numbers like 8 and -8. The lesson explains that the opposite of the opposite of a number is simply the original number. Students complete practice problems finding the opposite of the opposite of numbers in a table. The lesson concludes with students applying this concept to real world examples involving temperatures, distances, weights and money amounts.