This paper investigates the potential benefits of personalization in a mobile learning environment for high school students learning mathematics. Personalization was expected to benefit the students in two main ways. These are improving their performance in mathematics and making navigation of the application easier. Personalization was implemented in two different ways: Personalized Teacher Support and System Generated Personalization. The Personalized Teacher Support was used by the teacher to provide personalized feedback and encouragement to high school students while they were using the mobile learning system. The feedback was based on their performance during the mobile learning activities. The System Generated Personalization was provided in an effort to assist the learner in selecting a suitable activity based on their prior knowledge. This paper presents the details of the personalization used and the results obtained from our evaluation studies. The results show that the personalized teacher support encouraged the students to use the mobile learning activities more than those without it. The students also expressed that they thought the system generated personalization was helpful. The paper concludes with some suggestions for improvements to the personalized support for future research in mobile learning for mathematics based on these experiences.