This document provides information about measuring mass in grams and kilograms. It defines mass as a measure of how heavy an object is and notes that 1,000 grams equals 1 kilogram. Grams are used to measure lighter objects like paper clips, while kilograms are used to measure heavier objects like milk. Examples are provided to show converting between grams and kilograms. The document challenges the reader to practice identifying the appropriate unit to use in different mass measurement situations.