There are infinitely many answers. 1 times 81, for example.
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How about: 9 times 9 = 81 or 81 times 1 = 81
81 times 7 or 7 times 81 equals 567
81 times 8 = 648
9x9=81
The number 81 appears in several times tables. Specifically, it is found in the 9 times table (9 x 9 = 81) and the 3 times table (3 x 27 = 81). Additionally, it can be expressed in the 1 times table (1 x 81 = 81).