Span order
The first time you learned numbers in Spanish, you learned the cardinal numbers (uno, dos, tres...). This second time you will learn the ordinal numbers (first, second, third...).
First: primero
Second: segundo
Third: tercero
Fourth: cuarto
Fifth: quinto
Sixth: sexto
Seventh: séptimo, sétimo
Eighth: octavo
Ninth: noveno
Tenth: décimo
Keep the following in mind as you learn ordinal numbers:
When they are used as an adjective they must agree in number and gender with the noun they modify. Primer lugar, primera ganadora.
When primero and tercero come before a singular masculine noun, drop the ´o´. primer ganador, tercer lugar
For numbers past ten, it is common to use cardinal numbers: 21st century: el siglo veintiuno. For 11th and above, ordinal numbers are used mostly in formal situations. They are listed below:
11th: undécimo
12th: duodécimo
13th: decimotercero
14th: decimocuarto
15th: decimoquinto
16th: decimosexto
17th: decimoséptimo
18th: decimoctavo
19th: decimonoveno
20th: vigésimo
21st: vigésimo primero
22nd: vigésimo segundo
23rd: vigésimo tercero
24th: vigésimo cuarto
30th: trigésimo
31st: trigésimo primero
32nd: trigésimo segundo
40th: cuadragésimo
50th: quincuagésimo
60th: sexagésimo
70th: septuagésimo
80th: octogésimo
90th: nonagésimo
100th: centésimo
200th: ducentésimo
300th: tricentésimo
400th: cuadringentésimo
500th: quingentésimo
600th: sexcentésimo
700th: septingentésimo
800th: octingésimo
900th: noningentésimo
1,000th: milésimo
2,000th: dosmilésimo
3,000th: tresmilésimo
4,000th: cuatromilésimo
1,000,000,000th: millonésimo