Find the value of 2.2 + 4.08 + 3.125 + 6.3755.

Explanation

Out of all the four numbers 2.2 has got the least number of decimal places one. Hence we should retain only two decimal places in the remaining numbers. Hence 4.08 remains as it is 3.125 is to be rounded off as 3.12 (as 2 before 5 is even) 6.3755 is to be rounded off as 6.38 (as 7 before 5 is odd) . Now adding 2.2 + 4.08 + 3.12 +6.38 = 15.78.
Finally we should have only one decimal place and hence 15.78 is to be rounded off as 15.8.