Decomposable Modules

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I have a question relating to modules over rings: "Find a decomposition of of the module $\mathbb{Z}/10\mathbb{Z}$ over the ring $\mathbb{Z}$ into a direct sum of indecomposable modules." I understand the definition of a module and indecomposable module but am having trouble going about this question. Also how would I show a module such as $M=\{0,2,4,6,8\}$ is decomposable/indecomposable?