Question

Round off the following numbers upto three significant figures.
(i)2.520 , (ii)4.645 , (iii)22.78 , (iv)36.25

Answer 1

(i)2.520 Since 0 is less than 5, prededing digit is left unchanged . Hence , 2.52
(ii)4.645 since the digit to be dropped is 5 and preceding digit 4 is even .Hence , 4.64
(iii)22.78 Since the digit to be dropped, 8 is greater than 5 , the preceding digit 7, is raised by 1. Hence 22.8
(iv)36.35 Since the digit to be dropped is 5, and the preceding digit 3 is odd, we write the answer as 36.4