Guesstimate questions are those presented by interviewers in which the applicant is asked to estimate a figure based on very minimal information. Interviewers use these types of questions to discover applicants with strong mental math, logical thinking, problem-solving abilities, and background knowledge. Market-sizing questions are interview questions in which the applicant must estimate the market size of a product using minimal information, such as yearly gross sales, annual revenue, and so on. These questions need a strong grasp of arithmetic, logic, and problem-solving abilities, as well as a background in business, which aids interviewers in selecting qualified individuals.