Final answer:
Knowing both the US customary and metric systems of measurement is important due to their different advantages and practical applications in different contexts.
Step-by-step explanation:
The importance of knowing both the US customary and metric systems of measurement lies in their different advantages. The metric system is advantageous because conversions between metric units involve only powers of 10, which makes calculations simpler. Additionally, the same metric unit can be used over large ranges of values simply by using an appropriate metric prefix. On the other hand, the US customary system has its own advantages and is widely used in the United States. By understanding both systems, individuals can communicate effectively in different contexts and navigate between the two systems depending on the situation.