There are 25.4 tenths.
540
.2 = 2/10 = 2 tenths
Multiply 54 times 54, then move the decimal over two times, as there are 2 digits in the "tenths" place.
54
23
2.5 tenths
20 tenths
9/10 of 60 = 54
Five tenths
25 tenths.
54 minutes
There are 20 tenths because there are 10 tenths in one whole.