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How do I calculate (-54)10 in hexadecimal? The way I am doing it currently is that I am first converting (54)10 into hexadecimal which is (34)16. Next I am taking 16's complement. i.e. I am doing (FF)16 - (34)16 + 1, which comes to (CA)16. Thus, (-54)10 = (CA)16. Is this the right way to convert or is there some better method ?

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This is what I did

(54)10 in 8 bit binary is (00110110)2

(-54)10  in 2's complement representation is (11001010)2

Now form groups of 4 digits from LSB to MSB and it will represent equivalent hexadecimal digit as 4 digits in base 2 is one digit in base 16 $\because$ 24 = (16)1

$\therefore$ (1100 1010)2 = (CA)16

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