Prefix is used to increase or decrease the value of a fundamental or derived unit as per practical requirements

**Multiples** |
**Submultiples** |

Exa(a) = 10^{18} |
atto(a) = 10^{-18} |

Peta(P) = 10^{15} |
femto(f) = 10^{-15} |

Tera(t) = 10^{12} |
pico(P) = 10^{-12} |

Giga(G) = 10^{9} |
nano(n) = 10^{-9} |

Mega(M) = 10^{6} |
micro(μ) = 10^{-6} |

Kilo(k) = 10^{3} |
milli(m) = 10^{-3} |

Hecto(h) = 10^{2} |
centi(c) = 10^{-2} |

Deca(da) = 10^{1} |
deci(d) = 10^{-1} |