$\"\"$

The expression is $\"\"$ .

Place value chart for 18 and 12.

$\"\"$

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

$\"\"$

First find the sum of the ones digit.

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

The sum is 10, so carry digits to the next column on the left

$\"\"$

Next find the sum of the tens digit.

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

$\"\"$

The difference is $\"\"$ .