Parida, B.K. and Mohapatra, J.K. (2026) “‘BACK-OF-THE-ENVELOPE’ ESTIMATION: AN EXCELLENT PEDAGOGICAL TOOL”, SCHOOL SCIENCE, 54(4), pp. p. 17–24. Available at: https://ejournals.ncert.gov.in/index.php/SS/article/view/5161 (Accessed: 28 July 2026).