Learn Portuguese (Portugal): A conta é trinta euros.

No. While the numbers 1 and 2 change based on gender (like um vs uma), the tens like trinta (30) do not. It is always trinta, regardless of whether the noun is masculine like euros or feminine.

Why does the sentence use the singular verb é when thirty euros is plural?

The verb matches the subject of the sentence. Here, the subject is A conta (The bill), which is singular. Therefore, we use the singular é (is), even though the amount it describes is plural.

Can a conta be used for things other than a restaurant bill?

Yes! While it is the perfect word to ask for the check at a restaurant, a conta also means bill or account in other contexts, like a bank account (conta bancária) or an electricity bill (conta da luz).

How is the letter s at the end of euros pronounced?

In European Portuguese, an s at the very end of a word is usually pronounced like the English sh sound. So, euros sounds roughly like EH-oo-roosh.