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American dimes have 118 ridges on the edge. This is called reeding, which is a practice that dates back to when coins were made of gold and silver. Some people would shave off some metal from the coin, making it contain less than what it was worth. By adding a reeded edge, it prevented this practice. Though the metal content has long since been changed, the design was kept out of continuity.

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9y ago
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Q: How many ridges are on the outside of the dime and why?
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