In mathematics and computing, hexadecimal, or hex, is a positional numeral system with a base of 16. It uses sixteen distinct symbols, most often the symbols 0-9to represent values zero to nine, and A, B, C, D, E, F
A numerical subscript (itself written in decimal) can give the base explicitly: 159 10 is decimal 159; 159 16 is hexadecimal 159, which is equal to 345 10.
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13 = D in hex. If you're using two digits to represent the hex number - its 0D
16^2 = 256, so in hex, it is 100 - 1 = EE
170
43 = 2B
hex =7