The next step will be to determine if either of those two numbers appears in the Columns or Blocks that include the numbers in Row 3. The numbers 7 and 9 are the only two numbers that are missing from Row 3. The numbers 1, 8, 6, 3, 2, 4, and 5 are provided, so you will want to model for students a thought processes that goes something like this: Which of the numbers 1 to 9 are missing from Row 3 of the puzzle? In the sample puzzle above, Row 3 might be a good place to start because seven of the nine numbers in Row 3 are already provided. Next, introduce to students the concepts of elimination and narrowing down the possibilities.Ī good strategy for beginning to solve a Suduko puzzle is to search for a Row or Column or Block that has many of its squares already filled in. Block D is the block in left-center of the grid, which comprises squares in Rows 4, 5, and 6 and Columns 1, 2, and 3 Block C is the block in upper right that comprises squares in Rows 1, 2, and 3 and Columns 7, 8, and 9 Block B is the block in upper center that comprises squares in Rows 1, 2, and 3 and Columns 4, 5, and 6 Block A is the block in the upper left-hand corner of the grid, which comprises squares in Rows 1, 2, and 3 and Columns 1, 2, and 3
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