PARIDA, B. K.; MOHAPATRA, J. K. ‘BACK-OF-THE-ENVELOPE’ ESTIMATION: AN EXCELLENT PEDAGOGICAL TOOL. SCHOOL SCIENCE, [S. l.], v. 54, n. 4, p. p. 17–24, 2026. Disponível em: https://ejournals.ncert.gov.in/index.php/SS/article/view/5161. Acesso em: 28 jul. 2026.