This math topic focuses on practicing the polynomial algebra concept of the difference of squares. Specifically, it involves calculating expressions of the form \((a^2 - a) / a\) for given integer values, and finding the result without using a calculator. Each problem presents an expression with different integer bases, asking students to mentally compute this difference of squares and select the correct result from multiple choice options. This serves as an exercise in understanding polynomial identities within the broader context of polynomials and quadratics at an advanced level.