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Hexadecimal (base 16) uses digits 0–9 and letters A–F (10–15). One hex digit represents 4 bits (a nibble); two hex digits represent one byte (0x00–0xFF). Memory addresses, HTML color codes (#RRGGBB), and file signatures are commonly expressed in hex. Hex addition: carry when sum exceeds 0xF. Multiplication follows the same rules as decimal with base-16 carries.
Decimal: 255