Arrange some numbers in the following table: the first column, the second column, the third column, the fourth column, the first row 14510, the second row 481012, the third row 9121514? (2) What are the rows and columns of the number 81? (3) What are the rows and columns of the number 100?

(1) The number in the second column of row 10 is 4 × 10 = 40; (2) because 81 can only be the square of 9, the number 81 is in the first column of row 9; (3) ∵ 100 = 102, the number 100 is in the first column of row 10; ∵ 100 = 4 × 25, the number 100 is in the second column of row 25; ∵ 100 = 5 × 20, the number 100 is in the third column of row 20; ∵ 100 = 50 × 2 = (46 + 4) × 2, the number 100 is in the fourth column of row 46 Row 25, column 2, row 20, column 3, row 46, column 4

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