Solve the Addition Equation: Finding the Missing Number in 1000 + □ = 1500

To find the missing number in the equation $1000 + \Box = 1500$, we will follow these steps:

• Step 1: Identify the known values. We know $1000$ (the known addend) and $1500$ (the total sum).
• Step 2: Use subtraction to find the missing number. The missing number is the difference between the total sum and the known addend.

Now, perform the calculation:

Subtract $1000$ from $1500$:

$\Box = 1500 - 1000$

$\Box = 500$

Thus, the missing number is $500$.