Round off the following numbers up to 2 significant digits.
(a) 2462 (b) 76.14 (c )3.75 (d) 16.5.

Explanation

(a) Digits to be dropped are 6 and 2. Hence, the preceding digit 4 should be increased by one and two zeros are added after it which do not affect number of significant digits.
Hence, we can write the number as 2500.
(b) We can simply drop last two digits after decimal point so that only two significant digits are retained. Hence, we can write the number as 76.
(c ) We need to drop last digit which is 5 to retain two significant digits and the preceding digit is 7 which is an odd number hence it will be increased by one. Hence, we can write the number as 3.8.
(d) We need to drop last digit 5 to retain two significant digits and the preceding number is 6 which is an even number, so it will remain the same. Hence, we can write the number as 16.