This math topic focuses on converting different metric units of mass into grams, specifically units like hectograms (hg), decigrams (dg), kilograms (kg), centigrams (cg), and includes problems involving decimal values. The skill assessed is the conversion of smaller to base metric mass units, a fundamental aspect of the metric system. Each problem provides multiple choice answers, testing the student's ability to perform conversions correctly as part of an introductory course on metric unit conversion in measurement.