Evaluate each of the following, and write the answer to the appropriate number of significant figures.
$212.2 + 26.7 + 402.09$

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Solution

Find the value of the expressions:
Given expression to find $212.2 + 26.7 + 402.09$ .
Addition of the numbers is determined by adding the number in the corresponding digits.
Add the numbers by using vertical method.
$+ 212.2 26.7 238.9$
Add the answer with $402.09$ we get,
$\begin{matrix} 2 & 3 & 8 . & 9 \end{matrix} + \begin{matrix} 4 & 0 & 2 . & 0 & 9 \end{matrix} \begin{matrix} 6 & 4 & 0 . & 9 & 9 \end{matrix}$
Hence, $212.2 + 26.7 + 402.09 = 640.99$ .

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