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KenKen



Fill in the grid with numbers from 1 to the grid size, so that every number appears exactly once in each row and column (like in Sudoku), and so that all the arithmetic clues are satisfied. (i.e. the clue number in each region should be possible to construct from the numbers in the region using the specified arithmetic operation. Unlike in Sudoku, numbers may be repeated within a region.)

To place a number, click in a square to select it, then type the number on the keyboard. To erase a number, click to select a square and then press Backspace.

Right-click in a square and then type a number to add or remove the number as a pencil mark, indicating numbers that you think might go in that square. Click on the puzzle and press the M key to fill every square with a full set of pencil marks.

Courtesy of Simon Tatham's Puzzle Collection via the MIT license.


We hope that the free math worksheets have been helpful. We encourage parents and teachers to adjust the worksheets according to the needs of the child. For more difficult questions, the child may be encouraged to work out the problem on a piece of paper before entering the solution. We hope that the kids will also love the fun stuff and puzzles.

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