It is already rounded to the nearest ten as 840
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When rounding 840 to the nearest ten, you look at the digit in the tens place, which is 4. Since 4 is less than 5, you round down. Therefore, 840 rounded to the nearest ten is 840.
145
It is: 850
840
The answer will depend on the extent of rounding. To the nearest whole number it is 836, to the nearest million, it is 0.
840