% The ratio of the Z+jets cross section to the Z cross section was measured for % jets with pT>20 GeV and |eta|<2.5 using a cone algorithm with R=0.5. % R_i is the ratio of the cross section for Z+ i jets divided by the total Z boson cross section R_1 = [120.1 +- 3.3 (stat.) +15.6 - 17.1 (syst.) ] x 10^-3 R_2 = [ 18.6 +- 1.4 (stat.) + 6.2 - 5.0 (syst.) ] x 10^-3 R_3 = [ 2.80 +- 0.56 (stat.) +1.43 - 1.06 (syst.) ] x 10^-3 R_4 = [ 0.90 +- 0.44 (stat.) +0.48 - 0.40 (syst.) ] x 10^-3