# SI Divisor Prefixes

An **SI prefix** is a symbol attached to an SI unit that serves as short-hand for scientific notation. The **SI divisor prefixes** represent quantities that are orders of magnitude smaller than the base unit. They are used in unison with SI multiplier prefixes.

Prefix | $10^n$ | Symbol |

deci- | $10 ^ {-1}$ | d |

centi- | $10 ^ {-2}$ | c |

milli- | $10 ^ {-3}$ | m |

micro- | $10 ^ {-6}$ | $\mu$ |

nano- | $10 ^ {-9}$ | n |

pico- | $10 ^ {-12}$ | p |

femto- | $10 ^ {-15}$ | f |

atto- | $10 ^ {-18}$ | a |

zepto- | $10 ^ {-21}$ | z |

yocto- | $10 ^ {-24}$ | y |

How many meters are in $3,000,000 \text{ cm}$?

$3,000,000 \text{ cm} = 3\times 10^6 \text{ cm} = 3\times 10^6 \times 10^{-2} \text{ m} = 3\times 10^4 \text{ m} = 30,000 \text{ m}. \ _\square$

**Cite as:**SI Divisor Prefixes.

*Brilliant.org*. Retrieved from https://brilliant.org/wiki/si-divisor-prefixes/