"Zbývá osm set osmnáct korun."

Translation: Eight hundred and eighteen crowns is left.

[QuoErratDemo5tor]

I cannot believe "... crowns is left" is correct, I would have said ".... crowns are left".

[Poopinstei]

Grammatically the use of the singular verb is correct.
https://owl.english.purdue.edu/owl/resource/599/01/
See #7

My own instinct is to pluralize it, and I think colloquially a lot of people would.

[VladaFu]

We do accept the plural verb, but the singular is is preferred.

[venik212]

This came up in the past. Since a word for word translation is often impossible, I feel that imposing the Czech use of singular verbs when dealing with multiple objects into English is odd at best. At the reference suggested above I find: There were one hundred and thirty-five pieces in the puzzle, which is correct in English.

[VladaFu]

We would never force Czech grammar in English, that would just be nonsense.

https://ell.stackexchange.com/questions/119536/are-amounts-of-money-singular-or-plural
https://erinwrightwriting.com/use-plural-singular-verbs-money/
https://awelu.srv.lu.se/grammar-and-words/common-problems-and-how-to-avoid-them/subject-verb-agreement/sums-of-money-and-periods-of-time/

[SeanFogart4]

It is, because you are not talking about plural actual individual crowns (as in your puzzle pieces) but their singular amount value. The meaning is always more important than keeping strictly to one form. That's a mere formality. In English every rule has exceptions after all.

[MariaKlimm]

Yes, this was also my first thought. But I'm not a native speaker.

[MatousAc]

Shouldn't a numerical answer be correct as well?

[ValaCZE]

No. When you write numbers you will not learn anything.

[A477]

writing out czech numbers okay, but english ones rather nay