This math topic focuses on converting numbers from expanded form (written as words) to their normal numerical form. It specifically practices recognizing and forming three-digit numbers, helping enhance understanding of place values up to hundreds. Each problem presents a sum of terms in word form, and the learner is asked to identify the correct three-digit number from multiple choice options. These problems are part of a unit that extends to rounding numbers to thousands and hundredths, aiming to develop a strong foundation in place value comprehension.