In the given calendar, find the sum of the numbers marked inside the 3 × 3 box, without actually adding the numbers.

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Solution

To find the sum of the numbers marked inside the 3 × 3 box, select the middle number and multiply it by 9. The answer is the sum.

In this case, the middle number is 16.
9 × 16 = 144

Thus, 144 is the sum of all the numbers marked inside the 3 × 3 box.

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