Use the rules for addition of measurements to find the sum of the set of measurements. $\begin{array} { l l l l }
1.574 \mathrm {~cm} & 6.89 \mathrm {~mm} & 34.96 \mathrm {~cm} & 316 \mathrm {~mm}
\end{array}$
A) 82 cm
B) 81.82 cm
C) 80 cm
D) 81.8 cm
E) 120 cm

Question

Use the rules for addition of measurements to find the sum of the set of measurements.   $\begin{array} { l l l l } 
1.574 \mathrm {~cm} & 6.89 \mathrm {~mm} & 34.96 \mathrm {~cm} & 316 \mathrm {~mm}
\end{array}$
A) 82 cm
B) 81.82 cm
C) 80 cm
D) 81.8 cm
E) 120 cm

Quizplus · Accepted Answer

We first need to convert all measurements to the same unit, either centimeters or millimeters. Since there are fewer numbers in centimeters, we will convert all measurements to centimeters. 
$$1.574\mathrm{~cm} + 0.689\mathrm{~cm} + 34.96\mathrm{~cm} + 31.6\mathrm{~cm} = 68.823\mathrm{~cm}$$
Rounding to one decimal place, we get 81.8 cm, which is closest to choice D.

Use the Rules for Addition of Measurements to Find the Sum