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The multiples of 81 are infinite. The factors of 81 are: 1, 3, 9, 27, 81.
81= 1, 2,9, and 81 27= 1, 3,9, and 27
-1 × 81 -3 × 27 -9 × 9 -27 × 3 -81 × 1
Factors of 81 in pairs = 1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1.
1/3 of 81 = 27