$\"\"$

The expression is $\"\"$

Re write the expression is $\"\"$

Place value chart for 0.5and 3.5.

\ \ $\"\"$

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

Annex zero to align the numbers. $\"\"$

$\"\"$

Next find the sum of the tenths digit.

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

$\"\"$

Next find the sum of the ones digit.

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

$\"\"$

The sum is -3.