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This is a 5×5 grid. The first row from left to right contains the numbers 1, 2, 3, 4, and 5; the second row contains 6, 7, 8, 9, and 10; the third row contains 11, 12, 13, 1,4 and 15; the fourth row contains 16, 17, 18, 19, and 20 and the final row contains 21, 22, 23, 24, and 25. This is the same 5×5 number grid as in the previous diagram, but the numbers 3, 6 15, 17, and 24 have been shaded.