Question

measured value 28.7053 cm, which has six significant figures. round the measurement to three significant figures.
a 29 cm
b 28.7 cm
c 30 cm
d 28.71 cm

Explanation:

Step1: Identify significant figures

The original number is 28.7053. We want three significant figures.

Step2: Look at the fourth digit

The fourth digit after the first three significant - figures (28.7) is 0. Since 0 < 5, we do not round up the third significant figure.

Answer:

B. 28.7 cm