9*9=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
27 54 81 108 135 ..... just keep adding 27 each time