Final answer:
The missing number is 4.
Step-by-step explanation:
The box should be filled with the number 4.
The calculation is 7632 - 7000, which means we are subtracting 7000 from 7632.
To find the missing number, we can subtract the known number from the result. So, 7632 - 7000 = 632. Therefore, the missing number is 4.