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猫が**一匹**います。\n- 車は**一台**です。\n- 店（みせ）は**一階**にあります。\n\n## 「匹」の音の変化\n\n「匹」は「ひき・びき・ぴき」と読み方が変わります。\n\n| 数 | 読み | 数 | 読み |\n| --- | --- | --- | --- |\n| 一匹 | いっぴき | 六匹 | ろっぴき |\n| 二匹 | にひき | 七匹 | ななひき |\n| 三匹 | さんびき | 八匹 | はっぴき |\n| 四匹 | よんひき | 九匹 | きゅうひき |\n| 五匹 | ごひき | 十匹 | じゅっぴき・じっぴき |\n\n:::tip\n**一匹・六匹・八匹・十匹**は「ぴき」、**三匹**は「びき」です。何匹（なんびき）も「びき」で読みます。\n:::\n\n## 「台」は規則的\n\n「台」は、数の読みのあとに「だい」を付（つ）けます。助数詞の音は変わりません。\n\n| 数 | 読み |\n| --- | --- |\n| 一台 | いちだい |\n| 二台 | にだい |\n| 三台 | さんだい |\n| 四台 | よんだい |\n| 五台 | ごだい |\n| 六台 | ろくだい |\n| 七台 | ななだい |\n| 八台 | はちだい |\n| 九台 | きゅうだい |\n| 十台 | じゅうだい |\n\n:::example\n- 家（いえ）に自転車が**二台**あります。\n- 会社（かいしゃ）でパソコンを**五台**使（つか）います。\n- 駐車場（ちゅうしゃじょう）に車が**何台（なんだい）**ありますか。\n:::\n\n## 「階」の特別な読み\n\n「階」は、一、三、六、八、十で音に注意（ちゅうい）します。\n\n| 数 | 読み | 数 | 読み |\n| --- | --- | --- | --- |\n| 一階 | いっかい | 六階 | ろっかい |\n| 二階 | にかい | 七階 | ななかい |\n| 三階 | さんがい | 八階 | はっかい |\n| 四階 | よんかい | 九階 | きゅうかい |\n| 五階 | ごかい | 十階 | じゅっかい・じっかい |\n\n:::warning\n**三階**は「かい」ではなく、**さんがい**と読みます。**何階**は**なんがい**が標準（ひょうじゅん）ですが、**なんかい**も使われます。\n:::\n\n## 文の中で使う\n\n:::example\n- 公園（こうえん）に犬が**三匹**います。\n- 新（あたら）しい機械を**一台**買（か）いました。\n- 図書館（としょかん）は**四階**にあります。\n:::\n\n| 尋（たず）ねたいこと | 質問（しつもん） |\n| --- | --- |\n| 動物の数 | **何匹**いますか。 |\n| 機械や乗り物の数 | **何台**ありますか。 |\n| 建物の位置 | **何階**にありますか。 |\n\n「階」は物の数ではなく、建物のどの高さにあるかを示（しめ）します。\n\n## 助数詞を確認する\n\n1. 動物、機械、建物の階のどれかを決（き）めます。\n2. 「匹」と「階」は、数による音の変化を確認（かくにん）します。\n3. 文では、助詞の後に「数＋助数詞」を置けます。**犬が三匹います**、**パソコンを五台使います**のように言います。**三匹の犬がいます**は、「三匹」が「犬」を前から説明する形です。\n\n| 対象 | 助数詞 | 質問 |\n| --- | --- | --- |\n| 小さな動物 | **匹** | **何匹** |\n| 機械・乗り物 | **台** | **何台** |\n| 建物の位置 | **階** | **何階** 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