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Ordinal Numbers

Here are the ordinal numbers first - tenth:

primero first	sexto sixth
segundo second	séptimo seventh
tercero third	octavo eighth
cuarto fourth	noveno ninth
quinto fifth	décimo tenth

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Like many other adjectives, the ordinal numbers have a masculine and a feminine form.

primero  primera	sexto  sexta
segundo  segunda	séptimo  séptima
tercero  tercera	octavo  octava
cuarto  cuarta	noveno  novena
quinto  quinta	décimo  décima

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They also have a singular and plural form.

primero  primeros	sexto  sextos
segundo  segundos	séptimo  séptimos
tercero  terceros	octavo  octavos
cuarto  cuartos	noveno  novenos
quinto  quintos	décimo  décimos

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So, the ordinal numbers have four forms, just like other adjectives that end in -o.

primero
primeros
primera
primeras

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Primero and tercero drop the -o in the masculine singular adjective form.

el primer día
el tercer año

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Ordinal numbers usually precede the noun. However, if the noun they refer to is royalty, a pope, or a street, they come after the noun.

Carlos Quinto
("Quinto" comes after "Carlos" - royalty)

el quinto libro
("quinto" comes before "libro")

la Calle Sexta
("sexta" comes after "calle" - street)

la sexta pluma
("sexta" comes before "pluma")

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Ordinal numbers are not normally used after 10.

la Calle Dieciséis
Sixteenth Street

el siglo diecinueve
the nineteenth century