9*9=81
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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).
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81 and 162 are both multiples of 3. In mathematics, a number that can be divided by another number without leaving a remainder is said to be divisible by that number. Both 81 and 162 can be evenly divided by 3, making them multiples of 3.
1. The numbers are co-prime