18 is an integer, so no rounding is necessary. You can indicate the precision of the number, if you wish, using zeroes: 18.00.
18.00
0.07 is already to the nearest hundredth.
9.00
It is 81.10 to the nearest hundredth
what is the nearest hundredth to 87.8
0.44 to the nearest hundredth.
It is: 4.24 to the nearest hundredth
18.00
4.20
0.07 is already to the nearest hundredth.
9.00
4.89
0.33 is at the nearest hundredth.
It is 3.45 to the nearest hundredth
what is the nearest hundredth to 87.8
0.44 to the nearest hundredth.
13.00 is at the nearest hundredth.
To the nearest hundredth it is 0.15