# Question #c7216

##### 1 Answer

#### Answer:

#### Explanation:

When dealing with **addition or subtraction**, you need to keep track of the measurements that have the **smallest number of decimal places** because the result of the operation must be rounded to the *same number of decimal places* as the value with the **smallest number of decimal places**.

In your case, you have

#21.4color(white)(1)" " -># one decimal place,#4# #15color(white)(.11) " " -># no decimal place#17.17 " "-># two decimal places#4.003 " "-># three decimal places

This means that when you **add** these measurements, the result **cannot** have any decimal places. This is the case because your measurements include a value that has **no decimal places**.

So, perform the addition normally

#21.4 + 15 + 17.17 + 4.003 = 57.573#

and round the result to the **nearest whole number**.

#57.573 ~~ 58#

Keep in mind that you need to *round up* because the first digit that follows the decimal point, i.e.

#"digit " {(>= 5 implies "round up"), (< 5 implies "round down") :}#