Learn Romanian: Camera este numărul unu.

In Romanian, un and o are used when counting a specific noun, like saying one room (o cameră). But when you are just naming the number itself, counting out loud, or reading a label like number one, you use the bare number unu.

In English we say number one. Why is it numărul here instead of just număr?

In Romanian, when identifying something with a specific number like this, we actually say the number. The base word is număr, and adding -ul to the end makes it numărul, meaning the number.

Where is the word for the in Camera?

In Romanian, the word for the (the definite article) attaches to the end of the noun. The base word for room is cameră. To say the room, the ending changes to an a, making it camera.

Since camera is a feminine word, shouldn't the number be feminine too?

No, because the number unu here is acting as a label or a name for the room, not counting how many rooms there are. When numbers are used as labels (like room numbers, bus numbers, or page numbers), they stay in their default bare form.