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    <h1 class="tw:font-bold tw:[color:#27ae60]">数詞</h1>


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      <p>英語の数詞（<a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=numeral">numeral</a>）は、数や順序を表す言葉で、基本的に2つのカテゴリに分類されます。<br>
基数 (<a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=cardinal+numbers">cardinal numbers</a>) と序数 (<a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=ordinal+numbers">ordinal numbers</a>) です。</p>

<h2>1, 基数 (<a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=Cardinal+Numbers">Cardinal Numbers</a>)</h2>

<p>基数は、ものの数を表すために使われます。以下に基本的な基数を示します。</p>

<p>0 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=zero">zero</a><br>
1 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=one">one</a><br>
2 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=two">two</a><br>
3 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=three">three</a><br>
4 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=four">four</a><br>
5 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=five">five</a><br>
6 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=six">six</a><br>
7 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=seven">seven</a><br>
8 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=eight">eight</a><br>
9 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=nine">nine</a><br>
10 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=ten">ten</a></p>

<p>11 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=eleven">eleven</a><br>
12 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=twelve">twelve</a><br>
13 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=thirteen">thirteen</a></p>

<p>以降、20まで十と単位数を組み合わせて表現します（例：14 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=fourteen">fourteen</a>, 15 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=fifteen">fifteen</a>）</p>

<p>20 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=twenty">twenty</a><br>
30 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=thirty">thirty</a><br>
40 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=forty">forty</a><br>
50 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=fifty">fifty</a><br>
60 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=sixty">sixty</a><br>
70 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=seventy">seventy</a><br>
80 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=eighty">eighty</a><br>
90 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=ninety">ninety</a></p>

<p>100 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=one">one</a> <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=hundred">hundred</a><br>
1,000 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=one">one</a> <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=thousand">thousand</a><br>
1,000,000 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=one">one</a> <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=million">million</a><br>
1,000,000,000 - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=one">one</a> <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=billion">billion</a></p>

<p>基数は、上記の基本的な数詞を組み合わせることで、さまざまな数字を表現できます。<br>
例えば、「325」は <q><a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=three">three</a> <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=hundred">hundred</a> <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=twenty">twenty</a>-<a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=five">five</a></q> と表現されます。</p>

<h2>2, 序数 (<a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=Ordinal+Numbers">Ordinal Numbers</a>)</h2>

<p>序数は、順序や順位を表すために使われます。基数に接尾辞（-st, -nd, -rd, -th）を付けることで、序数が形成されます。以下に基本的な序数を示します。</p>

<p>1st - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=first">first</a><br>
2nd - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=second">second</a><br>
3rd - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=third">third</a><br>
4th - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=fourth">fourth</a><br>
5th - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=fifth">fifth</a><br>
6th - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=sixth">sixth</a><br>
以降、基数に <q>-th</q> を付けることで、表現できます（例：7th - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=seventh">seventh</a>, 8th - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=eighth">eighth</a>）</p>

<p>ただし、11th - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=eleventh">eleventh</a>, 12th - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=twelfth">twelfth</a>, 13th - <a class="word-with-searching-dict main-loading-show-btn phrase" data-turbo="true" data-turbo-stream="true" href="/ja/dictionaries/1/search?keyword=thirteenth">thirteenth</a> のように、11から13の序数も <q>-th</q> が付いた形になります。</p>

<p>これらの数詞は、数や順序を表現する際に非常に重要であり、英語の基本的な要素の一部です。</p>

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