KenKen Puzzle Number 1 - 4x4

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Solution for Problem 1

The first few problems with be easy ones using the 4x4 square.  It is a good idea to bear in mind that some cages always have limited possibilities.  Here are some examples with the possibilities shown in green.  Note:  these are vertical cages but horizontal ones are exactly the same.  Multiplication Cages two squares in size that contain prime numbers (or numbers with no other factors than themselves and 1 always have just two possibilities like the 3x cage below.