This math topic focuses on determining the full number from a given percent of the number, specifically using percentages that are multiples of 1%. The practice problems require solving questions in which one number is a specified percentage of another. For example, students might be asked to find what the total number is if 7.8 is 13% of that number. Each question provides multiple-choice answers, encouraging the application of percent calculations to solve real-world problems related to percentages.