# Learn and practice: Numbers in Spanish. 2

Hundreds
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.

Thousands
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.”

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