Answer:
Multiply by 8
Explanation:
To undo an arithmetic operation, such as division, an inverse operation needs to be applied, in this case multiplication.
Let x denote the number Bonita thought of. She then divided it by 8, so the result was x/8. She then, for some reason, forgot the original number x but still had access to x/8 and still remembered that she divided by 8. She can get the orginal number, x, by multiplying: (x/8)*8=x.
Multiplication and Division are mutually inverse. Addition and Subtraction are another example of mutually inverse operations.