Round off 4,639 to the nearest tens, hundred and thousands.
Rounding off
(i) Upto nearest tens
4,640
(ii) Upto nearest hundred
4600
(iii) Upto nearest tens
5000
Round off 5,67,40,23,981 to the nearest tens, hundred and thousands.
Rounding off 79,045 to the nearest ten thousand gives ___ and to the nearest hundred gives ___ .
Rounding off each number to the nearest tens before performing the required operation gives more accurate estimate than rounding off each number to the nearest hundreds or thousands.