# SI Divisor Prefixes

July Thomas
and
Jimin Khim
contributed

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/