Oh, dude, you're really making me do math right now? Ugh, fine. So, 250 rounded to the nearest 10 is 250. Because, like, it's already a multiple of 10. So, yeah, no need to stress about that one.
When rounding 250 to the nearest 10, you look at the digit in the tens place, which is 5. Since 5 is greater than or equal to 5, you round up. Therefore, 250 rounded to the nearest 10 is 250.
Well, honey, 250 rounded to the nearest 10 is 250. Why? Because it's already sitting pretty on a nice, round zero. No need to push it around when it's already where it wants to be.