How to round numbers in bash

I have a text file that I read for a number
Sometimes the number can be 1 decimal place other times it can have up to 3.  It's a temperature reading.  so 29.765 or 55.5 or 99.32

In bash, is there a way to make it 29.8, leave it at 55.5 and 99.3 ???

Tigger996Asked:
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