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Solution table

A common way to solve a sudoku is to use a solution table. This solution table contains all the numbers a cell can have. When starting on a sudoku the solution table contains the numbers 1-9 in all cells.

Reducing

When solving the sudoku you can reduce the numbers in the solution table using different "logical" methods. Then you cross off a number from the solution table to mark the number as not possible in that cell. When you have only 1 number left in a cell this number must be the solution for the cell.

Below you see a solution table ready to be used. I have made a printerfriendly version too.

123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789

If you want to learn methods you can use to reducing the solution table you can read about them in Reducingmethods