You have a few choices:
> 1 and 81
> 3 and 27
> 9 and 9
> 3 and 3 and 3
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9 x 9 = 81 :(
81
81 times 70 equals 5,670. This can be calculated by multiplying 81 by 70, which results in 5,670. To do this, you would multiply the tens place of 81 (which is 8) by 70, resulting in 560, and then multiply the ones place of 81 (which is 1) by 70, resulting in 70, and finally add these two products together to get the final answer of 5,670.
1 x 81, 3 x 27, 9 x 9.
These: 1 x 81, 3 x 27, 9 x 9