When the digit to be discarded is exactly 5 and is followed only by zeros
PHYSICS · Single correct · CBSE · Physics · Units and Measurements · Units and Measurements
Problem
When the digit to be discarded is exactly 5 and is followed only by zeros, the usual convention followed in NCERT texts is to:
(a) Always increase the preceding digit by 1. (Round 5 up)
(b) Adjust the number so that the preceding digit becomes even (increase it by 1 if it is odd).
(c) Adjust the number so that the preceding digit becomes odd (increase it by 1 if it is even).
(d) Always leave the preceding digit unchanged.