87.0
87.0
The digits after the decimal are: tenth, hundredth, thousandth, ten thousandth, one hundred thousandth and so on. So, for the tenth, just go out that many decimal places and round to there.
In this case:
87.00 to the tenth
tenth is the first decimal place, so: 87.0
8700
8700
8700
8700
8700
8700
8700
8700
8700
8700
8672 rounded to the nearest hundred is 8700.
8700