Better example: Decimal 3 in binary: 0011 (3). SD representation: 0101? 0×4 + 1×2 + (-1)×1? That’s 1. Not right.
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Let’s use a known correct mapping: Decimal 7 in 4-bit binary: 0111. SD: 1001 (1×8 + (-1)×4 + 0×2 + 1×1) = 8 – 4 + 1 = 5. No. Better example: Decimal 3 in binary: 0011 (3)