how to convert negative hexadecimal to decimal

without using a computer you can calculate it like this:

0xFFFF FE58 = - 0x1A8 = -(1 * 16² + 10 * 16 + 8) = -(256 + 160 + 8) = -424

0xFFFF FE58 is a negative number in 2’s complement. To get the absolute value you have to invert all bits and add 1 in binary. You also can subtract this number from the first number out of range (0x1 0000 0000)

 0x100000000
-0x0FFFFFE58
      =
 0x0000001A8

now we know that your number is -0x1A8. now you have to add up the digits multiplied with their place value. 8 * 16^0 + A (which is 10) * 16^1 + 1 * 16^2 = 424. So the decimal value of your number is -424.

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