This all depends what you are rounding up or down by. The
nearest whole number would be 580. The nearest tens place would
also be 580. If you were rounding it to the nearest hundred it
would be 600 and the nearest thousand would be 1,000.
Well, darling, 580 rounded to the nearest ten is 580. It's already sitting pretty on that ten, so no need to push it one way or the other. Just let it be fabulous at 580.
When rounding 580 to the nearest whole number, it would be rounded up to 600 because the digit in the tens place is 8, which is greater than or equal to 5. This is known as rounding up.