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# mantissa and exponent watch

1. So I understand how to represent a negative number in binary through twos compliment and the other method. I understand how to find the exponent however I can't understand how to find the mantissa, can anyine explain pls!.
Thank you on advance if I don't have time to see reply. 😊
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2. the first bit is a sign bit (+/-) negatives always start with 1. The exponent is used to give the mantissa an order of magnitude.

E.g. 10100 001 means 1.0100 *2^1 = 10.100 aka 2 + 0 + 0.5 = 2.5 but don't forget it started with a 1 in its normalised form so it's -2.5

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