The SI base unit for mass is the kilogram. No, it doesn't make any sense for the base unit to have a prefix, but the gram is inconveniently small for "everyday" use.
The SI unit for mass is the kilogram, denoted as kg.
The kilogram is the base unit of measure for mass.
The basic SI unit for mass is the kilogram (kg).
The official SI unit for mass is the kilogram.
The international (SI) unit of mass is the kilogram.
The SI unit which is used to measure mass is the kilogram.
kilogram
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The SI unit of mass is the kilogram (kg).
For length, the basic measure is the meter
kilograms
The SI unit used to measure mass is kilograms. It is written as Kg.