Solve the Addition Equation: 2346 + □ = 2646

To complete the equation $2346 + \Box = 2646$, we need to determine the value of the box, which represents the number needed to add to 2346 to yield 2646.

• Step 1: Set up the equation to solve for the missing number: $\Box = 2646 - 2346$.
• Step 2: Subtract 2346 from 2646.

Performing the subtraction gives:

$2646 - 2346 = 300$

Therefore, the missing number is 300.

From the given choices, the correct answer is $300$, which corresponds to Choice 2.

Thus, the value that completes the equation is $\Box = 300$.