Question

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

Explanation:

Step1: Add the values

$13.48+7.6 = 21.08$

Step2: Determine significant - figures for addition

When adding, we look at the decimal place of the least - precise number. 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:

d. 21.1 cm