ma·nip·u·la·tive 
(mə-nĭpyə-lə-tĭv, -lā′-)
(mə-nĭpyə-lə-tĭv, -lā′-)adj.
Serving, tending, or having the power to manipulate.
n.
Any of various objects designed to be moved or arranged by hand as a means of developing motor skills or understanding abstractions, especially in mathematics.
ma·nipu·la·tive·ly adv.
ma·nipu·la′tive·ness n.