Metric Mastery Practice Test

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Which item has a width of 18 mm?
Correct Answer:
Dime
Explanation:
Coin width is determined by its diameter, the measurement across the center of the coin. The dime has a diameter of about 17.91 mm, which rounds to 18 mm. The penny is about 19.05 mm, the nickel about 21.21 mm, and the quarter about 24.26 mm. So the item with a width around 18 mm is the dime.

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