Numerically-quantified expressions are an old puzzle within Slavic linguistics but they could be of interest for anyone working on syntax. We’ll discuss the internal structure of numerically quantified expressions in Polish and their associated morphosyntactic properties such as case and phi features. I will show that these properties interact with the rest of the clause, e.g. by disallowing regular agreement. The account proposed here is an initial but necessary step in explaining the vast cross-linguistic variation in the syntax of numerically-quantified expressions.