A16= 1010 B16= 1110 C16= 1210 D16= 1310 E16= 1410 F16= 1510
Its a concise way of expressing numbers. 25510 = FF16. FF = 15*16 + 15. Each digit to the left is 16 times the previous one 40016 = 4*256 = 1024.
Hexadecimal is a very convenient way of showing binary numbers as every 4 binary digits can be shown as one hexadecimal digit.
Glossary:A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
10112 = B16