Final answer:
The factor-label method, also known as dimensional analysis, is valuable for converting units because it simplifies complex calculations and ensures the appropriate cancellation or combination of units. It is especially useful for multi-step calculations and conversions with different quantities.
Step-by-step explanation:
The factor-label method, also known as dimensional analysis, is valuable for converting units because it allows for the simplification and organization of complex calculations. This method ensures that the units of quantities are subjected to the same mathematical operations as their associated numbers. By setting up conversion factors correctly, the labels (units) can be appropriately canceled or combined to yield the desired unit in the result. This approach is especially useful when dealing with multi-step calculations or conversions involving different quantities.