How many significant figures should be reported for the difference between 18.6172 mL and 18.57 mL?

Name: How many significant figures should be reported for the difference between 18.6172 mL and 18.57 mL?
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Question

Quizplus · Accepted Answer

The difference between 18.6172 mL and 18.57 mL is 0.0472 mL. Both numbers have 2 significant figures, so the answer should also have 2 significant figures. Therefore, the best choice is B, which represents 2 significant figures.

How Many Significant Figures Should Be Reported for the Difference