Divina, Devie Bandioan Comparative analysis using mathematical models and videos in teaching problem solving to grade 7 students / Devie Bandioan Divina. - Ilocos Sur Polytechnic State College : [s.n.], 2017. - ix, 80 pages : illustration ; 28 centimeter. References: pages 60-64. Subjects--Topical Terms: Teaching--Aids and devices. Dewey Class. No.: TH 371.33 D64c 2017