Question

what is 13.48 cm + 7.6 cm, rounded to the correct number of significant figures?
a 21 cm
b 21.08 cm
c 21.1 cm
d 21.080 cm

Explanation:

Step1: Perform addition

$13.48+7.6 = 21.08$

Step2: Determine significant - figures for addition

When adding, we consider the decimal places. 7.6 has one decimal place. So we round 21.08 to one decimal place.

Step3: Round the result

Rounding 21.08 to one decimal place gives 21.1.

Answer:

C. 21.1 cm