"Reasonable" depends on the cost of the lost precision. Compared with the original value, 40.1 is a quarter of one thousandths out while even 40 is only 2-and-a-bit of a thousandths out.
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213,345 rounded to the greatest place value is 213,350
5.1
Not sure about the range value and whether or not it can be rounded to 200 depends on the degree to which the numbers are being rounded.
300
60