Final answer:
The missing number in the equation 7/8 + blank = 1 is 1/8, as it completes the whole when added to 7/8.
Step-by-step explanation:
To find the missing number in the equation 7/8 + blank = 1, you need to understand the concept of fractions and how to find a number that, when added to another, equals a whole. In this case, since 1 is the whole, and you have 7/8 of it, you are missing 1/8 to make a whole. This is because 7/8 + 1/8 = 8/8, and 8/8 simplifies to 1.