This research is motivated by the low ability of mathematical problem solving of students and the lesson of mathematics less attention to the differences of intelligence of elementary school students. Brain Based Learning model is a learning model that is designed according to brain performance in thinking and solving problems. This model is suitable to solve the problem. The purpose of this study was to measure the difference of mathematical problem solving ability among students who obtained learning using Brain Based Learning model with students who received conventional learning. The method used is quasi experiment with design of non-equivalent control group desaign. The study was conducted as many as nine treatments. The research instrument used is problem solving and observation sheet. Data collection technique is done through pretest and posttest which then analyzed using normality test, homogeneity test, and mean difference. The population of this study were all elementary school students in Kiaracondong subdistrict of Bandung with class V sample SDN 161 Sukapura as experimental class and class V SDN 162 Warungjambu as control class. The average pretest grade of the experimental class is 23.83, while the average pretest grade of control is 22.28, it can be seen that the initial ability of the two classes does not differ significantly. The mean value of the experimental class posttest is 78.72, while the mean posttest grade of the control is 65.28. The average gain of the normalized experimental class is 0.7 with the high category, while the normalized gain average of the control class is 0.5 in the moderate category. The test result of the Independent T-Test posttest shows the number 0.000. It can be concluded that there is a significant difference of mathematical problem solving ability among students who obtained learning using Brain Based Learning model with students who received conventional learning. The researcher suggests implicating the model in elementary school so that students' mathematical problem solving ability develops optimally.