Subtract: 14.278m from 106.31m.The difference expressed in the correct number of significant figures is
A)92.032m
B)92.03m
C)92.0m
D)92m

Question

Quizplus · Accepted Answer

106.31m has 5 significant figures.
14.278m has 4 significant figures.
When subtracting, the answer should have the same number of decimal places as the number with the least decimal places.
Therefore, the answer should have 4 significant figures.

Subtracting 14.278m from 106.31m, we get 92.032m.
To have 4 significant figures, we round the answer to 92.03m.

Therefore, the best choice is B.