Question

according to rounding rules for addition, the sum of 27.1, 34.538, and 37.68 is _____.

99.3

99.31

99

99.318

Explanation:

Step1: Add the numbers

First, we add the three numbers: \(27.1 + 34.538 + 37.68\). Let's calculate the sum: \(27.1+34.538 = 61.638\), then \(61.638+37.68 = 99.318\).

Step2: Apply rounding rules for addition

The rounding rule for addition (or subtraction) is that the result should be rounded to the least number of decimal places among the numbers being added. Here, \(27.1\) has 1 decimal place, \(34.538\) has 3 decimal places, and \(37.68\) has 2 decimal places. The least number of decimal places is 1. So we round \(99.318\) to 1 decimal place. Looking at the second decimal place (1), which is less than 5, we round down. So \(99.318\) rounded to 1 decimal place is \(99.3\).

Answer:

99.3