The expression is 3 + 11.

Place value chart for 3.0 and 11.0.

Line up the decimal points and draw a line below the numbers.

First find the addition of the ones digit.

The addition of the ones digit 0 + 0 = 0

Next find the addition of the tens digit.

The addition of the tens digit 1 + 3 = 4.

The sum of the expression is 14.0.