The expression is

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 3+11=14 \ \

Next find the addition of the tens digit.

The addition of the tens digit =3+11=14  \ \

The sum is 14.0.    \ \