Without the rest of the information, it will be one of these: 13, 26, 39, 52, 65, 78, 91
I'm betting on 65.
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656+5=1165/13=5
2, 3 and 13
You need to add up the number of digits to the right of the decimal to find the number of digits in the answer. If the first factor has 2 digits to the right of the decimal point and the second factor has 3, the final answer will have 5 digits to the right of the decimal point.
The largest digits number with only 2 digits alike is 99
I did it by trial and error. 7^2 is 49. 4 + 9 = 13