When 15.5 + 0.125 + 2.55 are added, assuming each of the numbers below is measured, the answer with the correct number of significant figures is ___.

Question

Quizplus · Accepted Answer

The rule for addition and subtraction with significant figures is that the result should be reported to the least number of decimal places of any number in the operation. In this case, 15.5 has one decimal place, so the final answer should be rounded to one decimal place, making 18.2 the correct choice.

When 155 + 0