Answer :

9.08=0 is the tenth place
18976.4=4 is the tenth place
23.9876=9 is the tenth place
11.5=5 is the tenth place

the number in front of the decimal is the ones place and the number after the decimal is the tenths place that is how i remember it so 
9.08 0 is after the decimal so it is in the tenths place
9.08 underline the 0
18976.4 underline the 4
23.9876 underline the 9
11.5 underline the 5