From 100 to 1000
Cien is exactly 100. As soon as another number follows, it becomes ciento: ciento uno, ciento veinte. There is no y between the hundreds and the rest — the y only joins the tens and the units (ciento treinta y dos).
| The book has one hundred and twenty pages. | El libro tiene ciento veinte páginas. |
| 100 cien / ciento | 400 cuatrocientos | 700 setecientos |
| 200 doscientos | 500 quinientos | 800 ochocientos |
| 300 trescientos | 600 seiscientos | 900 novecientos |
Three are irregular: quinientos (not cincocientos), setecientos and novecientos.
| There are five hundred books in the library. | Hay quinientos libros en la biblioteca. |
Hundreds agree
From 200 on, the hundreds behave like adjectives: before a feminine noun they end in -as.
| There are two hundred houses in the village. | Hay doscientas casas en el pueblo. |
| The book has six hundred pages. | El libro tiene seiscientas páginas. |
A thousand
Mil never changes and never takes un: mil euros, dos mil años.
| A thousand euros is a lot of money. | Mil euros es mucho dinero. |
| The cathedral is a thousand years old. | La catedral tiene mil años. |
A million: un millón de
Unlike mil, millón is a noun. It takes un, it has a plural (dos millones), and de joins it to what you count: un millón de personas, tres millones de euros. Followed by another number, it takes no de: un millón doscientos mil (1,200,000).
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