In this lesson, students apply what they have learned about working with exponents and powers of 10 to solve problems in context. Students begin by considering questions about the tallest building in the world and what information would be needed to answer those questions (MP4). They have the opportunity to ask for the relevant information and use operations with exponents to compare several very large values. An optional activity allows students an additional opportunity to consider what information is needed to solve a problem about distances to the Moon, ask for that information, and solve the problem. Students must interpret the meaning of their answers in context (MP2).