This study aims to see the learning outcomes of prospective mathematics teacher students on problem-posing abilities using the Android Package Kit (APK). It is necessary to have innovation in learning so that it has a better problem-posing ability. During a pandemic like this time teaching and learning activities experience many obstacles. To overcome these obstacles, it is necessary to do learning innovations, one of which is online learning. This study used a quasi-experimental design using the first experimental group and the second experimental group known as the pretest-posttest control group design. The subjects of this study were second-semester students majoring in Mathematics Education. Collecting data using the online method or online (Covid-19 pandemic). The sample was determined using a purposive sampling technique to determine the first experimental class as many as 28 students and the second experimental class as many as 29 students. The experimental class uses problem-based learning, while the second experimental class uses direct learning according to the material content. The material in this research is opportunity theory. The results of the observed data were analyzed quantitatively. The learning results show that learning using APK was effective in improving learning outcomes (both in problem-based learning classes and indirect learning). In the evaluation phase, improvements were made to the APK that had been developed after reflection on the results in the field at the implementation stage. The results showed that online learning based on android applications as a very helpful means of maximizing teaching and learning activities.
Key words: Problem-posing, Online learning, APK
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