Declining indefinite numerals (wielu, kilkoma)

The Locative Case: -u

When using indefinite numerals like kilka (several/a few), parę (a couple), and wiele (many) with prepositions that require the Locative case (such as o, meaning "about"), they take the -u ending: kilku, paru, and wielu. The nouns that follow them must also be in the Locative plural.

The participants commented on several questionnaires.
Uczestnicy wypowiadali się o kilku kwestionariuszach.
Before we finished, we talked about a few interactions.
Zanim skończyliśmy, rozmawialiśmy o paru interakcjach.

The Instrumental Case: -oma

In the Instrumental case, wiele, kilka, and parę take the -oma ending: wieloma, kilkoma, and paroma. They agree with the noun, which takes the Instrumental plural.

Before we started the study, we talked to many target groups.
Zanim zaczęliśmy badanie, rozmawialiśmy z wieloma grupami docelowymi.

The Instrumental case is triggered not only by prepositions like z (with) but also by verbs like zarządzać (to manage).

We will be managing several target groups.
Będziemy zarządzali kilkoma grupami docelowymi.
He shared his suggestions with a couple of pollsters.
Dzielił się swoimi sugestiami z paroma ankieterami.

The Dative Case: -u

In the Dative case, these numerals share the exact same -u ending as they do in the Locative: wielu, kilku, and paru. You will often use the Dative with verbs like przyglądać się (to look closely at) or ufać (to trust), followed by a noun in the Dative plural.

The pollster is looking closely at several new trends.
Ankieter wnikliwie przygląda się kilku nowym tendencjom.
We trust many observations from these questionnaires.
Ufamy wielu obserwacjom z tych kwestionariuszy.