23.45 rounded to the nearest tenth?

Answer 1

23.5

Answer 2

We round up if the 100 place is 5 or more.
So in this case it is 5 exactly and we round up to 23.5.

Here is the rule:
If that digit is less than 5, do not change the rounding digit but drop all digits to the right of it.
If that digit is greater than or equal to five, add one to the rounding digit and drop all digits to the right of it.

Answer 3

32