$\"\"$

The expression is $\"\"$ .

Re write the expression is $\"\"$ .

Place value chart for 0.7and 0.4.

$\"\"$

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 $\"\"$ .