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.
Rounded to the nearest ten thousands it is 0. In fact, to the nearest ten it is 0.