Which term is a decimal unit of measurement of the metric system (based on meters and kilograms and seconds)?

• A. SI base unit
• B. Decimal unit
• C. Metric
• D. Base unit

Answer: (C)

The key idea is that this system of measurement is built on a decimal, base-10 framework. The term that names this whole system is metric, because it describes the decimal-based way of measuring that uses units like the meter, kilogram, and second with prefixes such as milli- and kilo-. An SI base unit is a single foundational unit (like the meter or the second), not the entire system, and a base unit is just one of those fundamental units. The phrase decimal unit isn’t a standard label for the system. So metric is the correct, most precise name for this decimal-based measurement system.