**How to Convert a Number from Decimal to IEEE 754 …**
https://www.wikihow.com/Convert-a-Number-from-Decimal-to-IEEE-754-Floating-Point-Representation

Feb 09, 2018 · The mantissa aspect, or the third part of the IEEE 754 conversion, is the rest of the number after the decimal of the base 2 scientific notation. You will just drop the 1 in the front and copy the decimal portion of the number that is being multiplied by 2. No binary conversion needed! For the example, the mantissa would be 010101001 from . 11 89%(392)

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