$\"\"$

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The expression is $\"\"$ .

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

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$\"\"$

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$\"\"$

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First find the sum of the ones digit.

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The sum of the ones digit = 7 + 8 = 15.

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$\"\"$

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$\"\"$

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Next find the sum of the ones digit.

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

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$\"\"$

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$\"\"$

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Next find the sum of the ones digit.

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

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$\"\"$

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$\"\"$

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The sum is 1025.