The 1867-1967 Canadian cent was issued to commemorate the Centennial of the Dominion of Canada (which occured in July 1867 with the uniting of the Province of Canada, New Brunswick and Nova Scotia as per the British North America Act). It is worth a few cents in circulated condition, and perhaps a dollar or so in Proof condition.
It's a common date, worth about 3 cents.
1918 is a relatively common date for Canadian large cents. On average, one is worth around two dollars.
Not a rare date. No added value in circulated condition.
It's a common date, worth at least $3 for the silver and up to $5 in good condition.
That depends on the series (date) and condition. The series 1986 is still worth two dollars.
1931 is not a rare date for these ... in average condition, it's worth about a dollar
1962 is a relatively common date. Canadian half dollars at the time were 80% silver with 20% copper, and are currently worth about six dollars just for the metal content.
Without knowing details like the date and condition, it's worth no less than 50 cents.
On 11/12/10, 20 euros = 27.6755 Canadian dollars. Use the link below for up to date conversion.
1939 is not a rare date for these -- in average condition it's worth about 5 cents
Canada did not strike any cents with that date. Please check the coin again and post a new question including any inscriptions that might help to ID it.
1907 is not considered a rare date for these coins. In average condition, it's worth a dollar or two. However, if it has an "H" mintmark (below the date), it will be rarer, and worth $10 to $20 or more.