Solve the Addition Equation: 1101 + □ = 1301

To solve this problem, follow these steps:

• Step 1: Identify the equation we are working with, $1101 + \Box = 1301$.
• Step 2: Recognize that the missing number can be found by re-arranging the equation to isolate the unknown. This involves subtraction.
• Step 3: Perform the calculation: subtract 1101 from 1301.

Let's work through the calculation:

$1301 - 1101 = 200$

Therefore, the missing number $\Box$ that completes the equation is $\boxed{200}$.