Mathematical education in elementary school is the key fundamental of math learning. It plays an important role of pupils' future math learning. This study tries to combine information technology and mathematics to build a mathematical learning environment in Second Life. We expect to create a new learning style for mathematical education in elementary school. While Second Life has got a lot of empirical results in education, some researches indicate that students need guidance or teaching aids to learn in such environments. In order to improve the pupil's learning outcomes, this study proposes a problem-based learning approach with teaching aids and embeds mathematical learning materials in the built virtual classrooms facilitating teaching as well as learning.