Solve the Multiplication Equation: 27 × ? = 27

To solve this problem, we'll apply the identity property of multiplication, which states that any number multiplied by 1 remains unchanged.

Let's explore this property in the given context:
We have the equation $27 \times ? = 27$.
According to the identity property, for the product to remain 27, the missing number must be 1, because $27 \times 1 = 27$.

Thus, the solution to the problem is to identify $?$ as 1.

Therefore, the solution to the problem is $1$.