To round the number 56.1 to the place of the underlined digit (which is 6 in the tenths place), we look at the digit immediately to the right of the underlined digit.
The number is 56.1, and the digit to the right of the 6 is 1.
Since 1 is less than 5, we round down.
Therefore, 56.1 rounded to the tenths place is 56.1.