Mangaoang, Melda J. Challenges and issues in teaching mathematics in the mother tongue / Melda J. Mangaoang. - Polytechnic College of La Union : [s.n.], 2020. - xii, 105 pages : illustrations ; 28 centimeter. Bibliography: pages 85-86. Subjects--Topical Terms: Elementary education. Mathematics. Dewey Class. No.: TH 372.7 M31c 2020