Final answer:
Chris can multiply 11 by 1 to get the product of 11, as multiplying a number by 1 results in the original number itself, which is known as the multiplicative identity.
Step-by-step explanation:
Chris needs to find the product of two numbers, where one of the numbers is 11 and the resulting product is also 11. To solve this, Chris can multiply 11 by the number 1 because the product of any number and 1 is the number itself. This rule applies because 1 is the multiplicative identity, which means when you multiply any number by 1, the result is the original number itself.
The equation for Chris's problem is:
When two positive numbers multiply, the answer has a positive (+ve) sign. Reciprocals and mental math also come into play when solving multiplication problems, but for this problem, the solution is straightforward as we're using the multiplicative identity.