Question

The correctly reported answer of the addition of 154.21, 6.142 and 23 will be:

• A. 183.352
• B. 183.35
• C. 183.4
• D. 183

Answer 1

The correct option is D 183

$154.21+6.142+23=183.352$

As 23 has no decimal place, i.e. minimum significant digit, hence, the reported sum = 183.

While limiting the result to the required number of significant figures as done in the above mathematical operation, one has to keep in mind the following points for rounding off the numbers:

• If the rightmost digit to be rounded is more than 5, then the preceding number is increased by one.
• If the rightmost digit to be rounded is less than 5, then the preceding number is not changed.
• If the rightmost digit to be rounded is 5, then the preceding number is not changed if it is an even number but it is increased by one then it is an odd number.