$(18 + 9) + 45 = 18 + (______+ 45)$

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Solution

The associative property of addition says that the sum of any three whole numbers remains same irrespective the order in which they are grouped.
$\Rightarrow (18 + 9) + 45 = 18 + (9 + 45)$ ( by associative property )
Hence, $9$ is the correct answer.

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