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KenKen - Another great Japanese puzzle Answered

KenKen is a new kind of logic puzzle from Japan by Tetsuya Miyamoto, who thought people were being failed by conventional methods of teaching. This is set to be the next sudoku The instructions are simple. These are for the puzzle in the second picture. All digits from 1 to 4 must be used in every row and column (no diagonals). The thick lined box has the target number for the values to reach in the thick box - one digit for a normal box. the symbol next to the value required is the only mathematical function you can use. Thick boxes that take up one normal box and have a a value - well, that value goes in that box. rules may differ slightly answers in picture 3