It depends on which coin. A 1940 cent isn't worth as much as a 1940 dime. You have to be more specific.
Ten cents was the value of the dime in 1940.
A 1981 Canadian dime is worth 10 cents in Canada.
10 Canadian cents
value of a 1944 dime
The 1950 Canadian dime is 80% silver currently worth about $1.60 USD
If you have a 1940 Roosevelt dime it is fake. The Roosevelt dime was not produced by the US Mint until 1946.
The value of a 1905 Canadian dime depends on it condition. You can expect to fetch anything from 9 and 28 US dollars for such a coin.
In circulated condition it has no added value.
They don't exist, the first Roosevelt dime was 1946. With a date of 1940 the dime is a MERCURY dime and is common with average values of $1.00-$3.00 depending on condition.
There is a 1921 dime that is estimated to only have 400 left.
It is worth 140$
A 1938 Canadian dime is worth approximately $1.30. The date on the coin does not mean much, however the dime is mainly comprised of silver.
If it is a circulated dime, then it is worth about $1.00, mostly depending on the value of silver
The exact value of a 1957 Canadian dime is actually dependent upon a number of factors. Most important fact being, the condition of the coin.
1940 dime were only made from 90% silver. See the related question below for more information.
Priceless. No barber dimes were minted anywhere near 1940.