The statement “x approximately equals 98” and the statement “x approximately equals 100” will likely be interpreted in different ways. I’d normally interpret the former to mean that x is likely between 97.5 and 98.5, and unlikely to be less than 96 or more than 100; whereas I’d usually interpret the latter more broadly (e.g. between 90 and 110). In particular, if the latter was rephrased to “x approximately equals 10^2”, I wouldn’t object to it being used to mean something as vague as “x is very likely to be somewhere between 30 and 300”.
The statement “x approximately equals 98” and the statement “x approximately equals 100” will likely be interpreted in different ways. I’d normally interpret the former to mean that x is likely between 97.5 and 98.5, and unlikely to be less than 96 or more than 100; whereas I’d usually interpret the latter more broadly (e.g. between 90 and 110). In particular, if the latter was rephrased to “x approximately equals 10^2”, I wouldn’t object to it being used to mean something as vague as “x is very likely to be somewhere between 30 and 300”.