Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
quŏtŭmus, a, um, adj. [quotus], of what number (Plautin.): quotumas aedes dixerit, ego incerto scio, Plaut. Ps. 4, 2, 7: quotumo die, on what day (by number)? id. ib. 4, 7, 77.‡ * quŏtuplex, ĭcis, adj. [quotus-plico], how many fold, how many times: quotuplex, ὁσαπλάσιος, Vet. Onomast.