Theory:

Adding \(0\) (zero) and multiplying \(1\) (one) to any integer will not change the result (or) the sum. This is called the identity property of integers.
Identity property of \(1\):
Identity property of \(1\) (one) says that any number multiplied by \(1\) (one) remains the same.
It can be represented as,
 
\(a × 1 = a\)
Example:
1. \(11 × 1 = 11\)
 
2. \(2 × 1 = 2\).
Important!
\(1\) (one) is called a multiplicative identity.