It depends on the weight of the letter and the value of the stamp you buy.
40
you need ten stamps actually i don't know
1 Canadian Stamp Approx. .52 cents canadian.
probably around 20
For a first class letter of one ounce, as many as it takes to add up to 98 cents of postage.
A single First Class stamp valued at 45 cents will work fine.
Two 37 cent stamps (assuming that the letter doesn't weigh more than an ounce). But as you only need to put one 41-cent stamp on the letter, you could go buy some 2-cent stamps and save yourself some money.
It takes three stamps to send a letter to Norway.
how many forever stamps = .94
3 stamps!
12 stamps
700 Stamps