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This study aims to determine the effectiveness of blended learning towards the improvement of pre-service teacher TPACK (Technological Pedagogical Content Knowledge) in developing multimedia learning mathematics in elementary schools. This research was quasi-experimental. The research method used was the control group pretest-posttest design. The population is the sixth-semester students of the academic year 2018/2019 of the Study Program Elementary Teacher Education Universitas Ahmad Dahlan as many as 315 students grouped in 7 classes. The sample used is one experimental class and one control class taken randomly. The method of collecting data uses observations in multimedia learning mathematics that have been developed by elementary school pre-service teacher. The research instrument uses TPACK assessment sheets that have been validated by experts. The results of the study show that t value is greater than t table. This means that at a significance level of 5% blended learning was effective towards increasing the TPACK of pre-service teachers in developing multimedia learning mathematics in elementary schools.