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As it is currently implemented, I don't believe slider has such an option to change the format of the displayed value. It would be a pretty easy project for a beginner to add this functionality to Sage. I could imagine changing the code in interact.py so that the display_value option could be passed a format like "%.1f" to indicate to display 1 decimal point.

I think that would be a valuable contribution, I would certainly use it in my interact demos.