what is the value of a 1956 canadian siver dollar
The value of a 1984 Canadian proof dollar is about $12.
Face value only if the coin was found in change. If it's in uncirculated or proof condition, those special collectors' coins can range from $3 to almost $40 at retail, depending on their quality.
NO
There is no such thing as a 1942 Canadian silver dollar.
Without further details, the best possible answer is that it's worth one dollar.
You did not give a denomination or condition. Assuming the coin is from circulation, it would be worth its face value times whatever the current U.S / Canadian exchange rate is - maybe around 0.85 U.S. cents to the Canadian dollar. For example a Canadian quarter would be worth 0.85 x 25 cents or about 21 U.S. cents.
Depending on condition, anywhere from 50.00 to 400.00.
Starting in 1968, Canadian dimes, quarters, half dollars, and dollars were all made of nickel, not silver. It's worth one dollar in Canada.
These coins were struck in steel to free up nickel for the war effort. They are worth about 20 cents if worn, up to maybe $1.50 in XF condition.
There's no such coin. JFK is on the half dollar. In 1971, President Eisenhower was on the dollar. Both coins are only worth face value if they're in circulated condition. They were only struck in copper-nickel, not silver so they have no added value.
A 1964 Canadian half-dollar has a value of approximately $12 Canadian dollars. This value is dependent on the current silver market.