The -40 (number) reference article from the English Wikipedia on 24-Apr-2004
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-40 (number)

Time you got around to sponsoring a child
Cardinal -40
Binary-101000 or 11011000
in two's complement
in a signed byte
Hexadecimal-28, or D8
in two's complement
in a signed byte

Minus forty, often referred to as 40 Below is:

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