Angele, Florinda V., Math in a challenging world teacher's guide 3/ Florinda V. Angeles, Rowena B. Malasig. - Marikina City : Instructional Coverage System Publishing, Inc., 2017. - 195 pages : Tables, Illustrations; 27 cm. English ISBN: 971-719-488-2 Subjects--Topical Terms: Dewey Class. No.: 510 / An581m