How do you round 15 to the nearest ten?

Well, honey, to round 15 to the nearest ten, you look at the digit in the tens place, which is 1. Since the digit to the right of it is less than 5, you keep that 1 as it is and change all the digits to the right of it to zero. So, 15 rounded to the nearest ten is 10. Hope that clears things up for ya!