# Question #d5112

##### 1 Answer

#### Explanation:

The thing to remember here is that when dealing with **addition** or **subtraction**, the result must have the same number of *decimal places* as the measurement with the **least number** of decimal places.

In your case, you have

#27.1 " " -> " " "1 decimal place: " .1# #34.538 " " -> " " "3 decimal places: " .538# #37.68 " " -> " " "2 decimal places: " .68#

This means that when you're **adding** these numbers, you must round the answer to **decimal place** because that's the least number of decimal places out of the three measurements.

So, perform the addition

#27.1 + 34.538 + 37.68 = 99.318#

Now, in order to round this number to **decimal place**, you must look at the figure that's in the *hundredths place*

#color(blue)(color(black)(99.3)1color(black)(8)#

and compare it to **add** *tenths place* and get rid of the rest of the decimals.

On the other hand, if this figure is *tenths place* **unchanged** and get rid of the rest of the decimals.

In your case, you have

#color(blue)(1) < color(red)(5)#

which means that you must leave the figure that is in the tenths place unchanged and get rid of the rest of the decimals.

#99.3color(red)(cancel(color(black)(color(blue)(1)8)))#

Therefore, you can say that you have

#27.1 + 34.538 + 37.68 = 99.3#

The answer is rounded to one **decimal place**.