7) The product of any number and one is that number. For example, a x $1=a$. Property:

Step 1 ：The problem is asking to demonstrate the Identity Property of Multiplication, which states that the product of any number and one is that number itself.

Step 2 ：We can demonstrate this property with a simple function that multiplies any given number by 1.

Step 3 ：The function will return the input number itself, as the product of any number and one is that number itself.

Step 4 ：Let's test this function with a few examples.

Step 5 ：The function returns the input number itself for all tested cases, which confirms the Identity Property of Multiplication.

Step 6 ：Final Answer: \(\boxed{\text{The product of any number and one is that number itself}}\)