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Interactive Learning Media (ILM) has been developed to represent base of number concept turn into more interactive and meaningful learning. The first design of ILM is multimedia supported computer that explore number concept in existing conceptual. Pre-service elementary teachers should be provided with the learning that can optimize the number conceptions. To collect and analyse data comprehensively, researchers developed a 4D developing method which has comprehensive stages: define, design, develop, and desseminate. The 4D developing stage has been utilized to describe ILM comprehensively. Based on data analysis, it can be concluded that ILM could effectively improve pre-service teachers‟ conceptual understanding and could facilitate self-study of pre-service elementary teachers about number concept.