280 ends in zero, so it is already rounded to a ten.
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What does 279 round to?
When rounding 281 to the nearest ten, you look at the digit in the tens place, which is 8. Since 8 is greater than or equal to 5, you round up. Therefore, 281 rounded to the nearest ten is 280.
280
Ten integers can be rounded off to 280. An infinite number of numbers can be rounded off to 280.
How do you round 392 to the nearest ten