What are ordinal numbers (first, second, third...)

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Ordinal numbers indicate the position that an element occupies in a series, order or hierarchy. Examples of ordinal numbers are: first (1st), second (2nd), third (3rd), eleventh (11th), twentieth (20th), thirtieth (30th), fortieth (40th), fiftieth (50th), seventieth (70th) and eighty-fourth (84.º).

Ex. 1: "My socks are in the Monday drawer". Ex. 2: "she is in octave week of gestation". Ex. 3: "The team won its ninth state title".

Ordinal numbers, also called ordinal numbers, can be represented in full (first, fifteenth and fifty-eighth), in Arabic numerals (1st, 15th, 58th) or in Roman numerals (Ex.: Pope John Paul II, IV Festival de Winter). In the case of representation by Arabic numerals, the number must always be followed by a dot (.) and the ordinal indicator, which can be masculine (º) or feminine (ª).

List of ordinal numbers

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Ordinal number (in digit) Ordinal number (in full)
1.º first
2.º second
3.º third
4.º bedroom
5.º fifth
6.º sixth
7.º seventh
8.º eighth
9.º ninth
10.º tenth
11.º eleventh
12.º Twelfth
13.º Thirteenth
14.º fourteenth
15.º fifteenth
16.º sixteenth
17.º seventeenth
18.º eighteenth
19.º nineteenth
20.º twentieth
30.º thirtieth
40.º fortieth
50.º fiftieth
60.º sixtieth
70.º seventieth or seventieth
80.º eightieth
90.º ninetieth
100.º hundredth
200.º hundredth
300.º three hundredth
400.º four hundredth
500.º fiftieth
600.º six hundredth or six hundredth
700.º seven hundredth or seven hundredth
800.º eighty
900.º ninetyth
1.000.º thousandth
10.000.º ten thousandth
100.000.º hundredth thousandth
1.000.000.º millionth
1.000.000.000.º billionth

Ordinal numbers are part of a grammatical class called numeral. In addition to the ordinal numbers, there are the numbers cardinals (one, two, ten, fifty etc), the multiplicatives (double, triple, sixfold, eightfold, etc.), the fractional (one third, two fifths, one eighth, twelfth etc.) and the collectives (dozen, quarantine, ten, semester etc).

Unlike ordinal numbers, which indicate the position of an element in a series, the Cardinal numbers are those that name or indicate a precise amount of something. Ex. 1: "There is 25 students in the classroom". Ex. 2: "I have nine pens in the case". Ex. 3: "I want six buns, please".

List of ordinal numbers from 1 to 100

Ordinal number (in digit) Ordinal number (in full)
1.º first
2.º second
3.º third
4.º bedroom
5.º fifth
6.º sixth
7.º seventh
8.º eighth
9.º ninth
10.º tenth
11.º eleventh
12.º Twelfth
13.º Thirteenth
14.º fourteenth
15.º fifteenth
16.º sixteenth
17.º seventeenth
18.º eighteenth
19.º nineteenth
20.º twentieth
21.º twenty-first
22.º twenty second
23.º twenty-third
24.º twenty fourth
25.º twenty-fifth
26.º twenty-sixth
27.º twenty-seventh
28.º twenty-eighth
29.º twenty ninth
30.º thirtieth
31.º thirty first
32.º thirty second
33.º Thirty third
34.º thirty-fourth
35.º thirty-fifth
36.º thirty sixth
37.º thirty-seventh
38.º thirty eighth
39.º thirty ninth
40.º fortieth
41.º forty-first
42.º forty-second
43.º forty-third
44.º forty-fourth
45.º forty-fifth
46.º forty-sixth
47.º forty-seventh
48.º forty eighth
49.º forty ninth
50.º fiftieth
51. Fifty first
52.º fifty-second
53.º fifty third
54.º fifty fourth
55.º fifty-fifth
56.º fifty-sixth
57.º fifty-seventh
58.º fifty eighth
59.º fifty-ninth
60.º sixtieth
61.º sixty first
62.º sixty second
63.º sixty-third
64.º sixty fourth
65.º sixty-fifth
66.º sixty-sixth
67.º sixty-seventh
68.º sixty eight
69.º sixty ninth
70.º seventieth or seventieth
71.º seventy-First
72.º seventy second
73.º seventy-third
74.º seventy-fourth
75.º seventy-fifth
76.º seventy-sixth
77.º seventy-seventh
78.º seventy eighth
79.º seventy ninth
80.º eightieth
81.º eighty first
82.º eighty second
83.º eighty third
84.º eighty fourth
85.º eighty-fifth
86.º eighty-sixth
87.º eighty-seventh
88.º eighty eighth
89.º eighty ninth
90.º ninetieth
91.º ninety first
92.º ninety second
93.º ninety-third
94.º ninety-fourth
95.º ninety-fifth
96.º ninety-sixth
97.º ninety-seventh
98.º ninety-eighth
99.º ninety-ninth
100.º hundredth

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