What is "normal" depends on your need.
To paraphrase what John from PA said, divide the focal length you are using on a full frame body by 1.6 to get the focal length that will give the same FOV on a crop camera.
Conversely, multiply the focal length you are using on a crop body by 1.6 to get the focal length that would provide the same FOV on a full frame body.
Example: 50mm is usually "normal" for a full frame sensor. Put it on a crop body, and it will give the same FOV as 80mm on a full frame body, which is a short telephoto. 50 x 1.6 = 80.