Solve the Equation: Finding the Missing Number in 3030 - □ = 3020

To solve this problem, we need to determine the number that, when subtracted from 3030, gives us 3020.

Let's follow these steps:

• Step 1: Set up the equation $3030 - \Box = 3020$.
• Step 2: To find the value of $\Box$, we rearrange the equation: $\Box = 3030 - 3020$.
• Step 3: Perform the subtraction: $3030 - 3020 = 10$.

Therefore, the number that completes the equation is $10$.