The background of this research is a passive activity that indicated the students because of that the result of student learning outcomes is low, thus requiring a new learning strategy that is used paper folding media because it can viewed from its shape, the geometric shapes of colored paper, can facilitate students to manipulate. Subjects were third class of SDN Nginden Jangkungan I/247 Surabaya is about 39 students. This research uses classroom action research design that consisted of two cycles. Percentage of teacher activity at the first cycle is 65% and 87,5% in the second cycle. While the percentage of student activities at the first cycle is 60% and 90% for the second cycle. For student learning outcomes, there is also increasing with the average score of 67,03 for the first cycle and 80 for the second cycle. This research indicated that folding paper as concrete media is work to increase the student's outcome for mathematics for third class of SDN Nginden Jangkungan I No. 247 Surabaya.