What do you need to Know?
Convert hex, binary integers to Decimal
Convert decimal integers to hex, binary
Convert hex to binary, binary to Hex
N binary digits can represent 2N values, unsigned integers 0 to 2N-1.
ASCII, UNICODE are binary codes for character data
BCD code is alternate code for representing decimal digits
Gray codes can also represent decimal digits; adjacent values in Gray codes change only by one bit.