Columbia City, Indiana. Columbia City is a city in Columbia Township, Whitley County, in the U.S. state of Indiana. The population was 8,750 at the 2010 census. The city is the county seat of Whitley County.
Hence, hex digits are 0,1,2,3,4,5,6,7,8 and 9 A, B, C, D, E, F. This number system is the most commonly used in mathematics and information technologies. I.e. in html programming colors can be represented by a 6-digit hexadecimal number: FFFFFF represents white, 000000 represents black, and so on.
For instance, in the 1/3 example above, you have to multiply 3 hex by 5 hex. You know that 3 base ten times 5 base ten equals 15 base ten, so you are almost there. You slip back into hex mode by realizing that 15 base ten is the same as F in hex. So, 3 times 5 is F. But keep those side-trips into base ten separate.