# 0から100までの数字と序数の英語（one、two、threeとfirst、second、third）

3番目のような「～番目」を序数といって、3のようなと明確に区別される。

## 英語の序数のルール

・「1」「2」「3」以外の数は「数」に「th」をつける
・「5」は「fifth」にする
・「8」は「eighth」にする
・「9」は「ninth」にする
・「12」は「twelfth」にする

・「ty」で終わる数は「tieth」にする（「y」を「ie」にする）
・「1」「2」「3」のみ「first」「second」「third」

## 英語の数と序数一覧

0 zero
1 one first
2 two second
3 three third
4 four fourth
5 five fifth
6 six sixth
7 seven seventh
8 eight eighth
9 nine ninth
10 ten tenth
11 eleven eleventh
12 twelve twelfth
13 thirteen thirteenth
14 fourteen fourteenth
15 fifteen fifteenth
16 sixteen sixteenth
17 seventeen seventeenth
18 eighteen eighteenth
19 nineteen nineteenth
20 twenty twentieth
21 twenty one twenty-first
22 twenty two twenty-second
23 twenty three twenty-third
24 twenty four twenty-fourth
25 twenty five twenty-fifth
26 twenty six twenty-sixth
27 twenty seven twenty-seventh
28 twenty eight twenty-eighth
29 twenty nine twenty-ninth
30 thirty thirtieth
31 thirty one thirty-first
32 thirty two thirty-second
33 thirty three thirty-third
34 thirty four thirty-fourth
35 thirty five thirty-fifth
36 thirty six thirty-sixth
37 thirty seven thirty-seventh
38 thirty eight thirty-eighth
39 thirty nine thirty-ninth
40 forty fortieth
41 forty one forty-first
42 forty two forty-second
43 forty three forty-third
44 forty four forty-fourth
45 forty five forty-fifth
46 forty six forty-sixth
47 forty seven forty-seventh
48 forty eight forty-eighth
49 forty nine forty-ninth
50 fifty fiftieth
51 fifty one fifty-first
52 fifty two fifty-second
53 fifty three fifty-third
54 fifty four fifty-fourth
55 fifty five fifty-fifth
56 fifty six fifty-sixth
57 fifty seven fifty-seventh
58 fifty eight fifty-eighth
59 fifty nine fifty-ninth
60 sixty sixtieth
61 sixty one sixty-first
62 sixty two sixty-second
63 sixty three sixty-third
64 sixty four sixty-fourth
65 sixty five sixty-fifth
66 sixty six sixty-sixth
67 sixty seven sixty-seventh
68 sixty eight sixty-eighth
69 sixty nine sixty-ninth
70 seventy seventieth
71 seventy one seventy-first
72 seventy two seventy-second
73 seventy three seventy-third
74 seventy four seventy-fourth
75 seventy five seventy-fifth
76 seventy six seventy-sixth
77 seventy seven seventy-seventh
78 seventy eight seventy-eighth
79 seventy nine seventy-ninth
80 eighty eightieth
81 eighty one eighty-first
82 eighty two eighty-second
83 eighty three eighty-third
84 eighty four eighty-fourth
85 eighty five eighty-fifth
86 eighty six eighty-sixth
87 eighty seven eighty-seventh
88 eighty eight eighty-eighth
89 eighty nine eighty-ninth
90 ninety ninetieth
91 ninety one ninety-first
92 ninety two ninety-second
93 ninety three ninety-third
94 ninety four ninety-fourth
95 ninety five ninety-fifth
96 ninety six ninety-sixth
97 ninety seven ninety-seventh
98 ninety eight ninety-eighth
99 ninety nine ninety-ninth
100 one hundred one hundredth
101 one hundred one one hundred and first
102 one hundred two one hundred and second
103 one hundred three one hundred and third

## 序数の使い方と例文

I am a third year student.

This is the fifth chapter.
これは第五章だ。

one-fourth

three-fourth