DnumSlider Value between next value ?

I would like to set a value between the next value in a DNumSlider ( Derma )
Ex: I would like to make the slider change of value 100 by 100 ( if the value is 200, the next possible value 'll be 300)
I try to put NumSlider:SetDecimals(-2) but it dosen’t work

thanks in advance for your help.