sci.lang.japan FAQ / 12. Numbers, counting, and dates

12.4. How do I write or say a mathematical expression in Japanese?

This simple page is the result of a discussion on sci.lang.japan on how to say mathematical expressions out loud in Japanese. The information that came out of that discussion seemed too useful to waste, so I have prepared this page as a summary.

Note:

  • for + and - it is common to hear プラス purasu and マイナス mainasu instead of the native Japanese たす and ひく. プラス and マイナス seem to be used more often for complicated equations.
  • English Japanese Japanese - Romanized
    A + B = C A たす(足す) B は C A tasu B wa C
    A - B = C A ひく (引く) B は C A hiku B wa C
    A × B = C A かける (掛ける) B = C A kakeru B wa C
    A / B = C A わる (割る) B は C A waru B wa C
    AB = C A の B じょう (乗) は C A no B jō wa C
    14X/5Y 5 Y ぶん (分) の 14 X 5 Y bun no 14 Y
    square root of A A の ルート
    A の へいほうこん (平方根)
    A の じじょうこん (自乗根)
    A の にじょうこん (二乗根)
    A no rūto
    A no heihōkon
    A no jijōkon
    A no nijōkon
    cube root of B B の さんじょうこん (三乗根)
    B の りっぽうこん (立方根)
    B no sanjōkon
    B no rippōkon
    x の にじょう (二乗)
    x の じじょう (自乗)
    (the の can be omitted)
    x no nijō
    x no jijō
    (the "no" can be omitted)
    f(x) = ... エフ x は ...
    かんすう (関数) エフ x は ...
    エフ かっこ (括弧) x
    efu x wa ...
    kansū efu x wa ...
    efu kakko x
    f'(x) f ダッシュ x
    f プライム x
    f dasshu x
    f puraimu x
    X! X の かいじょう (階乗) X no kaijō
    |X| X の ぜったいち (絶対値) X no zettaichi
    ln(x) x の しぜんたいすう (自然対数)
    エル エヌ x
    x no shizentaisū
    eru enu x
    log_base_b(x) ログ b の x rogu b no x
    dx/dt d x d t d x d t
    integral (x² - 4x + 9)dx インテグラル (かっこ) x にじょう マイナス よん x プラス きゅう (かっことじる) ディ x
    x にじょう ひく よん x たす きゅう の インテグラル
    x にじょう ひく よん x たす きゅう の x せきぶん (積分)
    integuraru (kakko) x nijō mainasu yon x purasu kyū (kakko tojiru) di x
    x nijō hiku yon x tasu kyū no integuraru
    x nijō hiku yon x tasu kyū no x sekibun

    Acknowledgements

    This page was originally one of Jim Breen's Mini-FAQ pages and is used with permission.


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