Which student correctly used guess and check to determine the unknown number?

The product of a number and eight is 104.
Brock’s Work
8 + 104 = 122
The answer is 122.
Jalen’s Work
104 – 8 = 96
The answer is 96.
Fiona’s Work
8 times 104 = 832
The answer is 832.
Nina’s Work
13 times 8 = 104
The answer is 13.