Both numbers were incorrectly rounded down. Perhaps this means students can no longer learn, “Round down from 49 or lower; round up from 50 or higher.”
That’s the way I learned it but to be even more correct and not to introduce bias whenever it is truly _ 50 (Not 501 or 50001) you round to the nearest even.
For example,
350 rounds up to 400 because 4 is even
450 rounds down to 400, not up to 500 (because 5 is odd)