It is 280 (according to IEEE standard 754).
Unfortunately, many schools teach that 5 and higher numbers should be rounded up and 4s and lower rounded down. Unfortunately that method introduces a systematic upward bias.
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300
Nearest ten THOUSAND : 40000. Nearest ten THOUSANDTH : 43678.4268.
To the nearest ten thousandths, 582.0910 To the nearest ten thousands, zero
1394 to the nearest ten is 1390.
To the nearest ten thousandth, 12.1756 To the nearest ten thousand, zero.