This is the 10814th most frequent Polish word.
działkami
"Plots" or "allotments," often referring to small pieces of land for gardening.
In the sentence, 'działkami' is instrumental plural, expressing the entities involved in the contracts: plots of land.
Zawarto umowy kupna działkami.
Purchase agreements for plots were concluded.
In this sentence, 'działkami' refers to 'plots' or 'tracts of land' (instrumental plural form) being used for recreational purposes.
Kupujemy działkami działki rekreacyjne na weekend.
We are purchasing lots as recreational plots for the weekend.
Here, 'działkami' takes the meaning of plots of land (instrumental plural), and shows interest in land acquisition.