I am confused on how to present this in decimal value

Would it be just the negative value of 223 or would it be -125?

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Would it be just the negative value of 223 or would it be -125?

Neither. Signed magnitude representation reserves one bit to represent the sign, and the remaining bits make up the value.

In this case:

  • bits 0-6 are 1011111, which is 95 in decimal
  • bit 7 is 1, meaning the value is negative

So the result is -95.

As for your calculation of -125, it appears you got that backwards. 125 is 1111101 in binary. Definitely got your wires crossed there.