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

Explanation

(i) 2.52(0) Since 0 is less than 5, preceding digit is left unchanged. Hence, 2.52
(ii) 4.64(5) Since the digit to be dropped is 5 and the preceding digit 4 is even. Hence, 4.64
(iii) 22.7(8) Since the digit to be dropped, 8 is greater than 5, the preceding digit 7, is raised by 1. Hence 22.8
(iv) 36.3(5) Since the digit to be dropped is 5, and the preceding digit 3 is odd, we write the answer as 36.4.