Oh, dude, you're hitting me with the big math questions! So, like, 170 rounded to the nearest 10 would be 170. Because, you know, it's already sitting pretty at a nice round number. No need to nudge it one way or the other.
When rounding 170 to the nearest 10, you look at the digit in the tens place, which is 7. Since 7 is greater than or equal to 5, you round up. Therefore, 170 rounded to the nearest 10 is 170 + 10 = 180.