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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.

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

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According to the US Mint, a dime has 118 reeds/ridges.

A US dime(10 cents) has 118 ridges to be exact.

They are actually called "Reeds" and the dime has 118 of them.

there are 118 ridges on a u.s. dime

118

Related questions

There is 118 ridges on a dime.

According to the US Mint, a dime has 118 reeds/ridges.

A US dime(10 cents) has 118 ridges to be exact.

They are actually called "Reeds" and the dime has 118 of them.

there are 118 ridges on a u.s. dime

118

The ridges around the edge of a dime is called reeding or milling. There are 118 ridges.

118 ridges are on a dimes edge

The United States dime (10 cents) has 118 edge ridges. The coin is 17.91 mm in diameter and is 1.35 mm thick

180 to be exact. found it in my adgenda

An American quarter has 119 ridges. Believe it or not, a dime has 118 ridges- that's only one more ridge!

118 seems to be the consensus on the web.