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The expression is \"\"

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 Place value chart for 78 and 592.

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\"\"

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

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Annex zero to align the numbers.

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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 = \"\".

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The sum is 16, so carry digits to the next column on the left.

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\"\"

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\"\"

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Next find the sum of the tens digit.

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

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The sum is 17, so carry digits to the next column on the left

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\"\"

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\"\"

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Next find the sum of the hundreds digit.

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The sum of the hundreds digit = \"\".

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\"\"

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\"\"

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The sum of the given expression is 670.