This math topic focuses on practicing long division without remainders. Specifically, students are tasked with identifying the correct divisor from multiple choices, given a division problem where the dividend and quotient are provided but the divisor is missing. It serves as an introductory exploration into the basics of long division, helping students understand the relationship between the divisor, dividend, and quotient in division problems. The questions progress through various numerical examples to reinforce understanding and accuracy in determining the divisor in one-step division operations.