The KenKen below was taken from a bank of KenKens from Mathdoku. Feel free to print it and try it or watch the video below as an example with explanation of the rules.

Video Example of the 4x4 KenKen Above.

0:00 - 2:00 - Instructions and Rules
2:00 - 8:21 - Doing the Puzzle
8:21 - 9:34 - Checking the Puzzle