  We present a formal scheme based cycle model for the motivic cohomology of
the fat points defined by the truncated polynomial rings $k[t]/(t^m)$ with $m
\geq 2$, in one variable over a field $k$. We compute their Milnor range cycle
class groups when the field has sufficiently many elements.
  With some aids from rigid analytic geometry and the Gersten conjecture for
the Milnor $K$-theory resolved by M. Kerz, we prove that the resulting cycle
class groups are isomorphic to the Milnor $K$-groups of the truncated
polynomial rings, generalizing a theorem of Nesterenko-Suslin and Totaro.
