The product of a number and its reciprocal is always 1.

Here's why:

* Reciprocal: The reciprocal of a number is simply 1 divided by that number. For example, the reciprocal of 5 is 1/5.

* Product: The product of two numbers means multiplying them together.

So, when you multiply a number by its reciprocal, you're essentially doing:

* Number * (1 / Number) = 1

The number cancels out, leaving you with just 1.