The basic prefixes are kilo, hecto, deka, milli, centi, and deci. The kilometer is 1000 times larger than the base unit, the meter. The hecto is 100 times larger and the deka is 10 times larger than the base unit. The millimeter is 1000 times smaller than the base unit, the meter. The centi is 100 times smaller and the deci is 10 times smaller.