Solve for the Missing Factor: ? × 1 = 99

To solve this problem, we need to apply the identity property of multiplication, which states:

• For any number $a$, multiplying by 1 yields the same number: $a \times 1 = a$.

Let's proceed with solving the equation:

The given equation is: $? \times 1 = 99$

According to the identity property, the value of '?' must be equal to 99. This is because multiplying any number by 1 gives the number itself. Therefore, $99 \times 1 = 99$.

Based on the properties of numbers, the correct value for '?' is $99$.

Thus, among the multiple-choice options provided, the correct choice is Option 1: 99.

Therefore, the solution to the problem is $? = 99$.