This math topic focuses on the conversion of different metric length units involving decimals, enhancing skills in unit conversion within the metric system. Students practice converting between millimeters, centimeters, decimeters, meters, decameters, hectometers, and kilometers. Each question provides a quantity in one metric unit and asks to convert it to another unit, offering multiple choices with only one correct answer. This topic is designed to reinforce understanding of metric units and decimal manipulation in measurement conversions.