Metric Mastery Practice Test

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What is the width of a penny?
Correct Answer:
19 mm
Explanation:
The width of a penny refers to its diameter—the distance across the coin through its center. A US penny has a diameter of about 19.05 millimeters, so 19 mm is the closest practical approximation among the options. The other choices are noticeably off: 18 mm is a bit too small, 21 mm is too large, and 24 mm is much larger than the real penny.

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