Learn and practice: Numbers in Spanish. 2

In Spanish, hundreds have several irregularities: One hundred is expressed as “cien” if it goes alone and as “ciento” if it is accompanied by tens or units. To express several hundreds, the plural “cientos” is used.
*The ending in -cientos becomes cientas if the noun that follows is feminine.

100 cien
101 ciento un(o)/ciento una
111 ciento once
123 ciento veintitrés
153 ciento cincuenta y tres
200 doscientos/doscientas
210 doscientos diez/doscientas diez
300 trescientos/trescientas
400 cuatrocientos/cuatrocientas
500 quinientos/quinientas (Irregular)
600 seiscientos/seiscientas
700 setecientos/setecientas (Irregular:
The i of siete disappears)
800 ochocientos/ochocientas
900 novecientos/novecientas (Irregular:
the u of nueve disappears)
999 novecientos noventa y nueve/novecientas noventa y nueve

The thousands are almost completely regular. The general rule is simply to write the number of thousands, followed by “mil“, plus any number that follows, except if the figure of thousands is 1. In this case the “un/o” is omitted, writing only “mil” instead of “un mil” but it is also permissible to write it that way, especially if you are issuing a cheque. To express numbers, the word “mil” remains invariant, but to express an indeterminate number, “miles” will be used, for example: “miles de personas se manifestaron.”

1000 mil
2000 dos mil
3000 tres mil
4000 cuatro mil
5000 cinco mil
6000 seis mil
7000 siete mil
8000 ocho mil
9000 nueve mil
10 000 diez mil
15 000 quince mil
20 000 veinte mil
21 000 veintiún mil
30 000 treinta mil
40 000 cuarenta mil
50 000 cincuenta mil
60 000 sesenta mil
70 000 setenta mil
80 000 ochenta mil
90 000 noventa mil
100 000 cien mil
101 005 ciento un mil cinco
108 000 ciento ocho mil
160 000 ciento sesenta mil
585 000 quinientos/ quinientas ochenta y cinco mil
999 000 novecientos/ novecientas noventa y nueve mil

Note that in Spanish we don’t add “y” after a hundred or a thousand. “Y” goes just between 31 and 99.