Floating-Point Arithmetic = What is the worst precision/difference from Dec to Binary?

It is not entirely clear to me what you are after, but you may be interested in the following paper which discusses many of the accuracy issues involved in binary/decimal conversion, including lists of hard cases.

Floating point will become more and more inaccurate the larger it gets (both in the positive and negative directions). This is because floating point values are an exponential format.

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