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Estimate the sum by rounding each number to the nearest whole number and then adding. $\newline$ $9.668 + 9.692$ $\newline$ The sum is approximately _____.

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Estimate sums and differences of decimals

Full solution

Q. Estimate the sum by rounding each number to the nearest whole number and then adding.

\newline

9.668 + 9.692

\newline

The sum is approximately _____.

Round to nearest whole number: Round first number to the nearest whole number. $9.668$ rounds to $10$
Add rounded numbers: Round second number to the nearest whole number. $\newline$ $9.692$ rounds to $10$
Add rounded numbers: Round second number to the nearest whole number. $\newline$ $9.692$ rounds to $10$ Add the rounded numbers. $\newline$ $10 + 10 = 20$

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