The Collaborative International Dictionary of English v.0.48:

Numerative \Nu"mer*a*tive\, a.
   Of or pertaining to numeration; as, a numerative system.
   --Eng. Cyc.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "numerative":
   algorismic, algorithmic, aliquot, approximative, calculating,
   cardinal, chorographic, computational, computative, computing,
   decimal, differential, digital, enumerative, estimating,
   estimative, even, exponential, figural, figurate, figurative,
   finite, fractional, hypsographic, imaginary, impair, impossible,
   infinite, integral, irrational, logarithmic, logometric, measuring,
   mensural, mensurational, mensurative, metric, negative, numeral,
   numerary, numeric, oceanographic, odd, ordinal, pair, positive,
   possible, prime, quantifying, quantitative, radical, rational,
   real, reciprocal, statistical, submultiple, surd, topographic,
   transcendental, valuational, valuative