1.
Parida BK, Mohapatra JK. ‘BACK-OF-THE-ENVELOPE’ ESTIMATION: AN EXCELLENT PEDAGOGICAL TOOL. SS [Internet]. 2026 Jul. 9 [cited 2026 Jul. 28];54(4):p. 17-24. Available from: https://ejournals.ncert.gov.in/index.php/SS/article/view/5161