25 + ⬜ = 42

The missing number is 17.

To find the missing number, subtract 25 from both sides of the equation:

⬜ = 42 - 25
⬜ = 17

To find the value of the square (⬜) that completes the equation 25 + ⬜ = 42, you need to isolate the square on one side of the equation.

Start by subtracting 25 from both sides of the equation:
25 + ⬜ - 25 = 42 - 25

This simplifies to:
⬜ = 17

Therefore, the value of the square (⬜) that completes the equation is 17.