It is the tens' place.
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A decimal number is one way of representing numbers where each place for a digit has a place value that is ten times that of the place to its right. Most all the numbers that you familiar with (judging from your question) will be decimal numbers. A decimal number need not be a [decimal] fraction.
The largest place value is the tenths place. The smallest is, well, infinite.
It is simply 725.0 as a decimal number
1 holds the hundredths place in 0.819
The number 3.5 is already rounded to one decimal place.