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What rules can be found in the math problem 8× 8 = 647× 9 = 637× 7 = 496× 8 = 485× 5 = 254× 6 = 24 in the third grade of primary school?
8×8=64 7×9=63 The second group 7×7=49 6×8=48 The third group 5×5=25 4×6=24.

Obviously, the first formula of these three groups is the multiplication of two identical numbers to get a number, and the second formula is the multiplication of the same number in the first formula. The product of the first formula is one larger than that of the second formula.

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