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.
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.