Unlike other number systems, the hexadecimal number system has digits from 0 – 9 and from 10 – 16 they are represented in symbols i.e 10 as A, 11 as B, 12 as C, 13 as D, 14 as E, and 15 as F. For example (28E)16 ( 28 E ) 16 , (AC7)16 ( A C 7 ) 16 , (EF.