Numbers from 31 to 99.

Between treinta (30) and cien (100), numbers are formed with the following structure: tens (30, 40, 50, etc.) + y + unit (1, 2, 3, etc.).

Treinta y uno (31).

Thirty-one (31). 

Cuarenta y tres (43).

Forty-three (43).

Sesenta y cinco (65)

Sixty-five (65).

Ochenta y seis (86).

Eighty-six (86).

Noventa y nueve (99).

Ninety-nine (99).

Note: for numbers which end in uno (treinta y uno, cuarenta y uno, etc.), uno becomes un in front of masculine nouns, and una in front of feminine nouns: 

Cincuenta y un coches (♂).

Fifty-one cars (♂).

Setenta y una personas (♀).

Seventy-one people (♀).

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