They aren't silver. Post 1964 dimes are struck in copper-nickel. If you have a dime dated 1965 or later, it is only worth 10 cents unless it is a proof.
Some US dimes were minted i966 on Planchets designated for foreign coins and are 40% silver ccontent. These are rare collector items that may be worth a few hundred dollars in today's market.
All pre-1965 US quarters and dimes are 90% silver.
All US dimes dated 1964 and earlier were struck in an alloy of 90% silver and 10% copper
US dimes were 90% silver through 1964. In 1965, the US shifted to clad coinage (75% copper, 25% nickel) for circulating coinage.
US silver dimes weigh 2.5 grams, dimes dated 1965 to date weigh 2.27 grams.
The ASW (Actual Silver Weight) of all 90% US silver dimes is .07234oz
Pre-1964 US dimes have collectible and silver values. 1965 to date are 10 cents.
Silver dimes were last minted in 1964 in the US.
All pre-1965 US quarters and dimes are 90% silver.
1964 and older US dimes contain 90% silver.
US dimes were struck in silver from 1796 to 1964.
US dimes were made of silver starting with the very first dimes back in 1796, and continued as such through 1964.
The last year for silver U.S. dimes was 1964.
Sorry, no US dimes dated 1973 were struck in silver the last year for silver dimes was 1964.
Roosevelt dimes from 1965, 1966, and 1967 were minted in large numbers to replace the silver dimes minted up till 1964. They're still found in change and have no added value in circulated condition. Uncirculated ones are worth $1 - $2 each. Note that there are no mint marks on US coins with those dates.
Average circulated 1950's dimes have silver values of $1.05 only coins graded EF-40 or better have higher values.
All US dimes dated 1964 and earlier were struck in an alloy of 90% silver and 10% copper
1964 was the last year for US silver dimes. The reason was because the value of the silver in a dime began to exceed ten cents.