$\"\"$

The expression is $\"\"$ .

Place value chart for 17 and $\"\"$ 28

$\"place$

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

Annex zero to align the numbers.

$\"\"$

First find the sum of the ones digit.

The sum of the ones digit = $\"\"$ .

$\"\"$

Next find the sum of the tenths digit.

The sum of the tenths digit = $\"\"$ .

$\"\"$

The sum is $\"\"$ 11.